linux/drivers/usb/gadget/udc/net2280.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Driver for the PLX NET2280 USB device controller.
   4 * Specs and errata are available from <http://www.plxtech.com>.
   5 *
   6 * PLX Technology Inc. (formerly NetChip Technology) supported the
   7 * development of this driver.
   8 *
   9 *
  10 * CODE STATUS HIGHLIGHTS
  11 *
  12 * This driver should work well with most "gadget" drivers, including
  13 * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  14 * as well as Gadget Zero and Gadgetfs.
  15 *
  16 * DMA is enabled by default.
  17 *
  18 * MSI is enabled by default.  The legacy IRQ is used if MSI couldn't
  19 * be enabled.
  20 *
  21 * Note that almost all the errata workarounds here are only needed for
  22 * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  23 */
  24
  25/*
  26 * Copyright (C) 2003 David Brownell
  27 * Copyright (C) 2003-2005 PLX Technology, Inc.
  28 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  29 *
  30 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  31 *      with 2282 chip
  32 *
  33 * Modified Ricardo Ribalda Qtechnology AS  to provide compatibility
  34 *      with usb 338x chip. Based on PLX driver
  35 */
  36
  37#include <linux/module.h>
  38#include <linux/pci.h>
  39#include <linux/dma-mapping.h>
  40#include <linux/kernel.h>
  41#include <linux/delay.h>
  42#include <linux/ioport.h>
  43#include <linux/slab.h>
  44#include <linux/errno.h>
  45#include <linux/init.h>
  46#include <linux/timer.h>
  47#include <linux/list.h>
  48#include <linux/interrupt.h>
  49#include <linux/moduleparam.h>
  50#include <linux/device.h>
  51#include <linux/usb/ch9.h>
  52#include <linux/usb/gadget.h>
  53#include <linux/prefetch.h>
  54#include <linux/io.h>
  55
  56#include <asm/byteorder.h>
  57#include <asm/irq.h>
  58#include <asm/unaligned.h>
  59
  60#define DRIVER_DESC             "PLX NET228x/USB338x USB Peripheral Controller"
  61#define DRIVER_VERSION          "2005 Sept 27/v3.0"
  62
  63#define EP_DONTUSE              13      /* nonzero */
  64
  65#define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  66
  67
  68static const char driver_name[] = "net2280";
  69static const char driver_desc[] = DRIVER_DESC;
  70
  71static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  72static const char ep0name[] = "ep0";
  73
  74#define EP_INFO(_name, _caps) \
  75        { \
  76                .name = _name, \
  77                .caps = _caps, \
  78        }
  79
  80static const struct {
  81        const char *name;
  82        const struct usb_ep_caps caps;
  83} ep_info_dft[] = { /* Default endpoint configuration */
  84        EP_INFO(ep0name,
  85                USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  86        EP_INFO("ep-a",
  87                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  88        EP_INFO("ep-b",
  89                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  90        EP_INFO("ep-c",
  91                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  92        EP_INFO("ep-d",
  93                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  94        EP_INFO("ep-e",
  95                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  96        EP_INFO("ep-f",
  97                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  98        EP_INFO("ep-g",
  99                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 100        EP_INFO("ep-h",
 101                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 102}, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
 103        EP_INFO(ep0name,
 104                USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 105        EP_INFO("ep1in",
 106                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 107        EP_INFO("ep2out",
 108                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 109        EP_INFO("ep3in",
 110                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 111        EP_INFO("ep4out",
 112                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 113        EP_INFO("ep1out",
 114                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 115        EP_INFO("ep2in",
 116                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 117        EP_INFO("ep3out",
 118                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 119        EP_INFO("ep4in",
 120                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 121};
 122
 123#undef EP_INFO
 124
 125/* mode 0 == ep-{a,b,c,d} 1K fifo each
 126 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 127 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 128 */
 129static ushort fifo_mode;
 130
 131/* "modprobe net2280 fifo_mode=1" etc */
 132module_param(fifo_mode, ushort, 0644);
 133
 134/* enable_suspend -- When enabled, the driver will respond to
 135 * USB suspend requests by powering down the NET2280.  Otherwise,
 136 * USB suspend requests will be ignored.  This is acceptable for
 137 * self-powered devices
 138 */
 139static bool enable_suspend;
 140
 141/* "modprobe net2280 enable_suspend=1" etc */
 142module_param(enable_suspend, bool, 0444);
 143
 144#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 145
 146static char *type_string(u8 bmAttributes)
 147{
 148        switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 149        case USB_ENDPOINT_XFER_BULK:    return "bulk";
 150        case USB_ENDPOINT_XFER_ISOC:    return "iso";
 151        case USB_ENDPOINT_XFER_INT:     return "intr";
 152        }
 153        return "control";
 154}
 155
 156#include "net2280.h"
 157
 158#define valid_bit       cpu_to_le32(BIT(VALID_BIT))
 159#define dma_done_ie     cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 160
 161static void ep_clear_seqnum(struct net2280_ep *ep);
 162static void stop_activity(struct net2280 *dev,
 163                                        struct usb_gadget_driver *driver);
 164static void ep0_start(struct net2280 *dev);
 165
 166/*-------------------------------------------------------------------------*/
 167static inline void enable_pciirqenb(struct net2280_ep *ep)
 168{
 169        u32 tmp = readl(&ep->dev->regs->pciirqenb0);
 170
 171        if (ep->dev->quirks & PLX_LEGACY)
 172                tmp |= BIT(ep->num);
 173        else
 174                tmp |= BIT(ep_bit[ep->num]);
 175        writel(tmp, &ep->dev->regs->pciirqenb0);
 176
 177        return;
 178}
 179
 180static int
 181net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 182{
 183        struct net2280          *dev;
 184        struct net2280_ep       *ep;
 185        u32                     max;
 186        u32 tmp = 0;
 187        u32 type;
 188        unsigned long           flags;
 189        static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
 190        int ret = 0;
 191
 192        ep = container_of(_ep, struct net2280_ep, ep);
 193        if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
 194                        desc->bDescriptorType != USB_DT_ENDPOINT) {
 195                pr_err("%s: failed at line=%d\n", __func__, __LINE__);
 196                return -EINVAL;
 197        }
 198        dev = ep->dev;
 199        if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 200                ret = -ESHUTDOWN;
 201                goto print_err;
 202        }
 203
 204        /* erratum 0119 workaround ties up an endpoint number */
 205        if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
 206                ret = -EDOM;
 207                goto print_err;
 208        }
 209
 210        if (dev->quirks & PLX_PCIE) {
 211                if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
 212                        ret = -EDOM;
 213                        goto print_err;
 214                }
 215                ep->is_in = !!usb_endpoint_dir_in(desc);
 216                if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
 217                        ret = -EINVAL;
 218                        goto print_err;
 219                }
 220        }
 221
 222        /* sanity check ep-e/ep-f since their fifos are small */
 223        max = usb_endpoint_maxp(desc);
 224        if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
 225                ret = -ERANGE;
 226                goto print_err;
 227        }
 228
 229        spin_lock_irqsave(&dev->lock, flags);
 230        _ep->maxpacket = max;
 231        ep->desc = desc;
 232
 233        /* ep_reset() has already been called */
 234        ep->stopped = 0;
 235        ep->wedged = 0;
 236        ep->out_overflow = 0;
 237
 238        /* set speed-dependent max packet; may kick in high bandwidth */
 239        set_max_speed(ep, max);
 240
 241        /* set type, direction, address; reset fifo counters */
 242        writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
 243
 244        if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
 245                tmp = readl(&ep->cfg->ep_cfg);
 246                /* If USB ep number doesn't match hardware ep number */
 247                if ((tmp & 0xf) != usb_endpoint_num(desc)) {
 248                        ret = -EINVAL;
 249                        spin_unlock_irqrestore(&dev->lock, flags);
 250                        goto print_err;
 251                }
 252                if (ep->is_in)
 253                        tmp &= ~USB3380_EP_CFG_MASK_IN;
 254                else
 255                        tmp &= ~USB3380_EP_CFG_MASK_OUT;
 256        }
 257        type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 258        if (type == USB_ENDPOINT_XFER_INT) {
 259                /* erratum 0105 workaround prevents hs NYET */
 260                if (dev->chiprev == 0100 &&
 261                                dev->gadget.speed == USB_SPEED_HIGH &&
 262                                !(desc->bEndpointAddress & USB_DIR_IN))
 263                        writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 264                                &ep->regs->ep_rsp);
 265        } else if (type == USB_ENDPOINT_XFER_BULK) {
 266                /* catch some particularly blatant driver bugs */
 267                if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
 268                    (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
 269                    (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
 270                        spin_unlock_irqrestore(&dev->lock, flags);
 271                        ret = -ERANGE;
 272                        goto print_err;
 273                }
 274        }
 275        ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
 276        /* Enable this endpoint */
 277        if (dev->quirks & PLX_LEGACY) {
 278                tmp |= type << ENDPOINT_TYPE;
 279                tmp |= desc->bEndpointAddress;
 280                /* default full fifo lines */
 281                tmp |= (4 << ENDPOINT_BYTE_COUNT);
 282                tmp |= BIT(ENDPOINT_ENABLE);
 283                ep->is_in = (tmp & USB_DIR_IN) != 0;
 284        } else {
 285                /* In Legacy mode, only OUT endpoints are used */
 286                if (dev->enhanced_mode && ep->is_in) {
 287                        tmp |= type << IN_ENDPOINT_TYPE;
 288                        tmp |= BIT(IN_ENDPOINT_ENABLE);
 289                } else {
 290                        tmp |= type << OUT_ENDPOINT_TYPE;
 291                        tmp |= BIT(OUT_ENDPOINT_ENABLE);
 292                        tmp |= (ep->is_in << ENDPOINT_DIRECTION);
 293                }
 294
 295                tmp |= (4 << ENDPOINT_BYTE_COUNT);
 296                if (!dev->enhanced_mode)
 297                        tmp |= usb_endpoint_num(desc);
 298                tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
 299        }
 300
 301        /* Make sure all the registers are written before ep_rsp*/
 302        wmb();
 303
 304        /* for OUT transfers, block the rx fifo until a read is posted */
 305        if (!ep->is_in)
 306                writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 307        else if (!(dev->quirks & PLX_2280)) {
 308                /* Added for 2282, Don't use nak packets on an in endpoint,
 309                 * this was ignored on 2280
 310                 */
 311                writel(BIT(CLEAR_NAK_OUT_PACKETS) |
 312                        BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 313        }
 314
 315        if (dev->quirks & PLX_PCIE)
 316                ep_clear_seqnum(ep);
 317        writel(tmp, &ep->cfg->ep_cfg);
 318
 319        /* enable irqs */
 320        if (!ep->dma) {                         /* pio, per-packet */
 321                enable_pciirqenb(ep);
 322
 323                tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
 324                        BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 325                if (dev->quirks & PLX_2280)
 326                        tmp |= readl(&ep->regs->ep_irqenb);
 327                writel(tmp, &ep->regs->ep_irqenb);
 328        } else {                                /* dma, per-request */
 329                tmp = BIT((8 + ep->num));       /* completion */
 330                tmp |= readl(&dev->regs->pciirqenb1);
 331                writel(tmp, &dev->regs->pciirqenb1);
 332
 333                /* for short OUT transfers, dma completions can't
 334                 * advance the queue; do it pio-style, by hand.
 335                 * NOTE erratum 0112 workaround #2
 336                 */
 337                if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 338                        tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 339                        writel(tmp, &ep->regs->ep_irqenb);
 340
 341                        enable_pciirqenb(ep);
 342                }
 343        }
 344
 345        tmp = desc->bEndpointAddress;
 346        ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 347                _ep->name, tmp & 0x0f, DIR_STRING(tmp),
 348                type_string(desc->bmAttributes),
 349                ep->dma ? "dma" : "pio", max);
 350
 351        /* pci writes may still be posted */
 352        spin_unlock_irqrestore(&dev->lock, flags);
 353        return ret;
 354
 355print_err:
 356        dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 357        return ret;
 358}
 359
 360static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 361{
 362        u32     result;
 363
 364        do {
 365                result = readl(ptr);
 366                if (result == ~(u32)0)          /* "device unplugged" */
 367                        return -ENODEV;
 368                result &= mask;
 369                if (result == done)
 370                        return 0;
 371                udelay(1);
 372                usec--;
 373        } while (usec > 0);
 374        return -ETIMEDOUT;
 375}
 376
 377static const struct usb_ep_ops net2280_ep_ops;
 378
 379static void ep_reset_228x(struct net2280_regs __iomem *regs,
 380                          struct net2280_ep *ep)
 381{
 382        u32             tmp;
 383
 384        ep->desc = NULL;
 385        INIT_LIST_HEAD(&ep->queue);
 386
 387        usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 388        ep->ep.ops = &net2280_ep_ops;
 389
 390        /* disable the dma, irqs, endpoint... */
 391        if (ep->dma) {
 392                writel(0, &ep->dma->dmactl);
 393                writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 394                        BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
 395                        BIT(DMA_ABORT),
 396                        &ep->dma->dmastat);
 397
 398                tmp = readl(&regs->pciirqenb0);
 399                tmp &= ~BIT(ep->num);
 400                writel(tmp, &regs->pciirqenb0);
 401        } else {
 402                tmp = readl(&regs->pciirqenb1);
 403                tmp &= ~BIT((8 + ep->num));     /* completion */
 404                writel(tmp, &regs->pciirqenb1);
 405        }
 406        writel(0, &ep->regs->ep_irqenb);
 407
 408        /* init to our chosen defaults, notably so that we NAK OUT
 409         * packets until the driver queues a read (+note erratum 0112)
 410         */
 411        if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
 412                tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
 413                BIT(SET_NAK_OUT_PACKETS) |
 414                BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 415                BIT(CLEAR_INTERRUPT_MODE);
 416        } else {
 417                /* added for 2282 */
 418                tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
 419                BIT(CLEAR_NAK_OUT_PACKETS) |
 420                BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 421                BIT(CLEAR_INTERRUPT_MODE);
 422        }
 423
 424        if (ep->num != 0) {
 425                tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
 426                        BIT(CLEAR_ENDPOINT_HALT);
 427        }
 428        writel(tmp, &ep->regs->ep_rsp);
 429
 430        /* scrub most status bits, and flush any fifo state */
 431        if (ep->dev->quirks & PLX_2280)
 432                tmp = BIT(FIFO_OVERFLOW) |
 433                        BIT(FIFO_UNDERFLOW);
 434        else
 435                tmp = 0;
 436
 437        writel(tmp | BIT(TIMEOUT) |
 438                BIT(USB_STALL_SENT) |
 439                BIT(USB_IN_NAK_SENT) |
 440                BIT(USB_IN_ACK_RCVD) |
 441                BIT(USB_OUT_PING_NAK_SENT) |
 442                BIT(USB_OUT_ACK_SENT) |
 443                BIT(FIFO_FLUSH) |
 444                BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 445                BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 446                BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 447                BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 448                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 449                BIT(DATA_IN_TOKEN_INTERRUPT),
 450                &ep->regs->ep_stat);
 451
 452        /* fifo size is handled separately */
 453}
 454
 455static void ep_reset_338x(struct net2280_regs __iomem *regs,
 456                                        struct net2280_ep *ep)
 457{
 458        u32 tmp, dmastat;
 459
 460        ep->desc = NULL;
 461        INIT_LIST_HEAD(&ep->queue);
 462
 463        usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 464        ep->ep.ops = &net2280_ep_ops;
 465
 466        /* disable the dma, irqs, endpoint... */
 467        if (ep->dma) {
 468                writel(0, &ep->dma->dmactl);
 469                writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
 470                       BIT(DMA_PAUSE_DONE_INTERRUPT) |
 471                       BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 472                       BIT(DMA_TRANSACTION_DONE_INTERRUPT),
 473                       /* | BIT(DMA_ABORT), */
 474                       &ep->dma->dmastat);
 475
 476                dmastat = readl(&ep->dma->dmastat);
 477                if (dmastat == 0x5002) {
 478                        ep_warn(ep->dev, "The dmastat return = %x!!\n",
 479                               dmastat);
 480                        writel(0x5a, &ep->dma->dmastat);
 481                }
 482
 483                tmp = readl(&regs->pciirqenb0);
 484                tmp &= ~BIT(ep_bit[ep->num]);
 485                writel(tmp, &regs->pciirqenb0);
 486        } else {
 487                if (ep->num < 5) {
 488                        tmp = readl(&regs->pciirqenb1);
 489                        tmp &= ~BIT((8 + ep->num));     /* completion */
 490                        writel(tmp, &regs->pciirqenb1);
 491                }
 492        }
 493        writel(0, &ep->regs->ep_irqenb);
 494
 495        writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 496               BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 497               BIT(FIFO_OVERFLOW) |
 498               BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 499               BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 500               BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 501               BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
 502
 503        tmp = readl(&ep->cfg->ep_cfg);
 504        if (ep->is_in)
 505                tmp &= ~USB3380_EP_CFG_MASK_IN;
 506        else
 507                tmp &= ~USB3380_EP_CFG_MASK_OUT;
 508        writel(tmp, &ep->cfg->ep_cfg);
 509}
 510
 511static void nuke(struct net2280_ep *);
 512
 513static int net2280_disable(struct usb_ep *_ep)
 514{
 515        struct net2280_ep       *ep;
 516        unsigned long           flags;
 517
 518        ep = container_of(_ep, struct net2280_ep, ep);
 519        if (!_ep || !ep->desc || _ep->name == ep0name) {
 520                pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 521                return -EINVAL;
 522        }
 523        spin_lock_irqsave(&ep->dev->lock, flags);
 524        nuke(ep);
 525
 526        if (ep->dev->quirks & PLX_PCIE)
 527                ep_reset_338x(ep->dev->regs, ep);
 528        else
 529                ep_reset_228x(ep->dev->regs, ep);
 530
 531        ep_vdbg(ep->dev, "disabled %s %s\n",
 532                        ep->dma ? "dma" : "pio", _ep->name);
 533
 534        /* synch memory views with the device */
 535        (void)readl(&ep->cfg->ep_cfg);
 536
 537        if (!ep->dma && ep->num >= 1 && ep->num <= 4)
 538                ep->dma = &ep->dev->dma[ep->num - 1];
 539
 540        spin_unlock_irqrestore(&ep->dev->lock, flags);
 541        return 0;
 542}
 543
 544/*-------------------------------------------------------------------------*/
 545
 546static struct usb_request
 547*net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 548{
 549        struct net2280_ep       *ep;
 550        struct net2280_request  *req;
 551
 552        if (!_ep) {
 553                pr_err("%s: Invalid ep\n", __func__);
 554                return NULL;
 555        }
 556        ep = container_of(_ep, struct net2280_ep, ep);
 557
 558        req = kzalloc(sizeof(*req), gfp_flags);
 559        if (!req)
 560                return NULL;
 561
 562        INIT_LIST_HEAD(&req->queue);
 563
 564        /* this dma descriptor may be swapped with the previous dummy */
 565        if (ep->dma) {
 566                struct net2280_dma      *td;
 567
 568                td = dma_pool_alloc(ep->dev->requests, gfp_flags,
 569                                &req->td_dma);
 570                if (!td) {
 571                        kfree(req);
 572                        return NULL;
 573                }
 574                td->dmacount = 0;       /* not VALID */
 575                td->dmadesc = td->dmaaddr;
 576                req->td = td;
 577        }
 578        return &req->req;
 579}
 580
 581static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
 582{
 583        struct net2280_ep       *ep;
 584        struct net2280_request  *req;
 585
 586        ep = container_of(_ep, struct net2280_ep, ep);
 587        if (!_ep || !_req) {
 588                dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
 589                                                        __func__, _ep, _req);
 590                return;
 591        }
 592
 593        req = container_of(_req, struct net2280_request, req);
 594        WARN_ON(!list_empty(&req->queue));
 595        if (req->td)
 596                dma_pool_free(ep->dev->requests, req->td, req->td_dma);
 597        kfree(req);
 598}
 599
 600/*-------------------------------------------------------------------------*/
 601
 602/* load a packet into the fifo we use for usb IN transfers.
 603 * works for all endpoints.
 604 *
 605 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 606 * at a time, but this code is simpler because it knows it only writes
 607 * one packet.  ep-a..ep-d should use dma instead.
 608 */
 609static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
 610{
 611        struct net2280_ep_regs  __iomem *regs = ep->regs;
 612        u8                      *buf;
 613        u32                     tmp;
 614        unsigned                count, total;
 615
 616        /* INVARIANT:  fifo is currently empty. (testable) */
 617
 618        if (req) {
 619                buf = req->buf + req->actual;
 620                prefetch(buf);
 621                total = req->length - req->actual;
 622        } else {
 623                total = 0;
 624                buf = NULL;
 625        }
 626
 627        /* write just one packet at a time */
 628        count = ep->ep.maxpacket;
 629        if (count > total)      /* min() cannot be used on a bitfield */
 630                count = total;
 631
 632        ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 633                        ep->ep.name, count,
 634                        (count != ep->ep.maxpacket) ? " (short)" : "",
 635                        req);
 636        while (count >= 4) {
 637                /* NOTE be careful if you try to align these. fifo lines
 638                 * should normally be full (4 bytes) and successive partial
 639                 * lines are ok only in certain cases.
 640                 */
 641                tmp = get_unaligned((u32 *)buf);
 642                cpu_to_le32s(&tmp);
 643                writel(tmp, &regs->ep_data);
 644                buf += 4;
 645                count -= 4;
 646        }
 647
 648        /* last fifo entry is "short" unless we wrote a full packet.
 649         * also explicitly validate last word in (periodic) transfers
 650         * when maxpacket is not a multiple of 4 bytes.
 651         */
 652        if (count || total < ep->ep.maxpacket) {
 653                tmp = count ? get_unaligned((u32 *)buf) : count;
 654                cpu_to_le32s(&tmp);
 655                set_fifo_bytecount(ep, count & 0x03);
 656                writel(tmp, &regs->ep_data);
 657        }
 658
 659        /* pci writes may still be posted */
 660}
 661
 662/* work around erratum 0106: PCI and USB race over the OUT fifo.
 663 * caller guarantees chiprev 0100, out endpoint is NAKing, and
 664 * there's no real data in the fifo.
 665 *
 666 * NOTE:  also used in cases where that erratum doesn't apply:
 667 * where the host wrote "too much" data to us.
 668 */
 669static void out_flush(struct net2280_ep *ep)
 670{
 671        u32     __iomem *statp;
 672        u32     tmp;
 673
 674        statp = &ep->regs->ep_stat;
 675
 676        tmp = readl(statp);
 677        if (tmp & BIT(NAK_OUT_PACKETS)) {
 678                ep_dbg(ep->dev, "%s %s %08x !NAK\n",
 679                        ep->ep.name, __func__, tmp);
 680                writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 681        }
 682
 683        writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 684                BIT(DATA_PACKET_RECEIVED_INTERRUPT),
 685                statp);
 686        writel(BIT(FIFO_FLUSH), statp);
 687        /* Make sure that stap is written */
 688        mb();
 689        tmp = readl(statp);
 690        if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
 691                        /* high speed did bulk NYET; fifo isn't filling */
 692                        ep->dev->gadget.speed == USB_SPEED_FULL) {
 693                unsigned        usec;
 694
 695                usec = 50;              /* 64 byte bulk/interrupt */
 696                handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
 697                                BIT(USB_OUT_PING_NAK_SENT), usec);
 698                /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 699        }
 700}
 701
 702/* unload packet(s) from the fifo we use for usb OUT transfers.
 703 * returns true iff the request completed, because of short packet
 704 * or the request buffer having filled with full packets.
 705 *
 706 * for ep-a..ep-d this will read multiple packets out when they
 707 * have been accepted.
 708 */
 709static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
 710{
 711        struct net2280_ep_regs  __iomem *regs = ep->regs;
 712        u8                      *buf = req->req.buf + req->req.actual;
 713        unsigned                count, tmp, is_short;
 714        unsigned                cleanup = 0, prevent = 0;
 715
 716        /* erratum 0106 ... packets coming in during fifo reads might
 717         * be incompletely rejected.  not all cases have workarounds.
 718         */
 719        if (ep->dev->chiprev == 0x0100 &&
 720                        ep->dev->gadget.speed == USB_SPEED_FULL) {
 721                udelay(1);
 722                tmp = readl(&ep->regs->ep_stat);
 723                if ((tmp & BIT(NAK_OUT_PACKETS)))
 724                        cleanup = 1;
 725                else if ((tmp & BIT(FIFO_FULL))) {
 726                        start_out_naking(ep);
 727                        prevent = 1;
 728                }
 729                /* else: hope we don't see the problem */
 730        }
 731
 732        /* never overflow the rx buffer. the fifo reads packets until
 733         * it sees a short one; we might not be ready for them all.
 734         */
 735        prefetchw(buf);
 736        count = readl(&regs->ep_avail);
 737        if (unlikely(count == 0)) {
 738                udelay(1);
 739                tmp = readl(&ep->regs->ep_stat);
 740                count = readl(&regs->ep_avail);
 741                /* handled that data already? */
 742                if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
 743                        return 0;
 744        }
 745
 746        tmp = req->req.length - req->req.actual;
 747        if (count > tmp) {
 748                /* as with DMA, data overflow gets flushed */
 749                if ((tmp % ep->ep.maxpacket) != 0) {
 750                        ep_err(ep->dev,
 751                                "%s out fifo %d bytes, expected %d\n",
 752                                ep->ep.name, count, tmp);
 753                        req->req.status = -EOVERFLOW;
 754                        cleanup = 1;
 755                        /* NAK_OUT_PACKETS will be set, so flushing is safe;
 756                         * the next read will start with the next packet
 757                         */
 758                } /* else it's a ZLP, no worries */
 759                count = tmp;
 760        }
 761        req->req.actual += count;
 762
 763        is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 764
 765        ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 766                        ep->ep.name, count, is_short ? " (short)" : "",
 767                        cleanup ? " flush" : "", prevent ? " nak" : "",
 768                        req, req->req.actual, req->req.length);
 769
 770        while (count >= 4) {
 771                tmp = readl(&regs->ep_data);
 772                cpu_to_le32s(&tmp);
 773                put_unaligned(tmp, (u32 *)buf);
 774                buf += 4;
 775                count -= 4;
 776        }
 777        if (count) {
 778                tmp = readl(&regs->ep_data);
 779                /* LE conversion is implicit here: */
 780                do {
 781                        *buf++ = (u8) tmp;
 782                        tmp >>= 8;
 783                } while (--count);
 784        }
 785        if (cleanup)
 786                out_flush(ep);
 787        if (prevent) {
 788                writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 789                (void) readl(&ep->regs->ep_rsp);
 790        }
 791
 792        return is_short || ((req->req.actual == req->req.length) &&
 793                        !req->req.zero);
 794}
 795
 796/* fill out dma descriptor to match a given request */
 797static void fill_dma_desc(struct net2280_ep *ep,
 798                                        struct net2280_request *req, int valid)
 799{
 800        struct net2280_dma      *td = req->td;
 801        u32                     dmacount = req->req.length;
 802
 803        /* don't let DMA continue after a short OUT packet,
 804         * so overruns can't affect the next transfer.
 805         * in case of overruns on max-size packets, we can't
 806         * stop the fifo from filling but we can flush it.
 807         */
 808        if (ep->is_in)
 809                dmacount |= BIT(DMA_DIRECTION);
 810        if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
 811                                        !(ep->dev->quirks & PLX_2280))
 812                dmacount |= BIT(END_OF_CHAIN);
 813
 814        req->valid = valid;
 815        if (valid)
 816                dmacount |= BIT(VALID_BIT);
 817        dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
 818
 819        /* td->dmadesc = previously set by caller */
 820        td->dmaaddr = cpu_to_le32 (req->req.dma);
 821
 822        /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 823        wmb();
 824        td->dmacount = cpu_to_le32(dmacount);
 825}
 826
 827static const u32 dmactl_default =
 828                BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 829                BIT(DMA_CLEAR_COUNT_ENABLE) |
 830                /* erratum 0116 workaround part 1 (use POLLING) */
 831                (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
 832                BIT(DMA_VALID_BIT_POLLING_ENABLE) |
 833                BIT(DMA_VALID_BIT_ENABLE) |
 834                BIT(DMA_SCATTER_GATHER_ENABLE) |
 835                /* erratum 0116 workaround part 2 (no AUTOSTART) */
 836                BIT(DMA_ENABLE);
 837
 838static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 839{
 840        handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 841}
 842
 843static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
 844{
 845        writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
 846        spin_stop_dma(dma);
 847}
 848
 849static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 850{
 851        struct net2280_dma_regs __iomem *dma = ep->dma;
 852        unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 853
 854        if (!(ep->dev->quirks & PLX_2280))
 855                tmp |= BIT(END_OF_CHAIN);
 856
 857        writel(tmp, &dma->dmacount);
 858        writel(readl(&dma->dmastat), &dma->dmastat);
 859
 860        writel(td_dma, &dma->dmadesc);
 861        if (ep->dev->quirks & PLX_PCIE)
 862                dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
 863        writel(dmactl, &dma->dmactl);
 864
 865        /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 866        (void) readl(&ep->dev->pci->pcimstctl);
 867
 868        writel(BIT(DMA_START), &dma->dmastat);
 869
 870        if (!ep->is_in)
 871                stop_out_naking(ep);
 872}
 873
 874static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 875{
 876        u32                     tmp;
 877        struct net2280_dma_regs __iomem *dma = ep->dma;
 878
 879        /* FIXME can't use DMA for ZLPs */
 880
 881        /* on this path we "know" there's no dma active (yet) */
 882        WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
 883        writel(0, &ep->dma->dmactl);
 884
 885        /* previous OUT packet might have been short */
 886        if (!ep->is_in && (readl(&ep->regs->ep_stat) &
 887                                BIT(NAK_OUT_PACKETS))) {
 888                writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
 889                        &ep->regs->ep_stat);
 890
 891                tmp = readl(&ep->regs->ep_avail);
 892                if (tmp) {
 893                        writel(readl(&dma->dmastat), &dma->dmastat);
 894
 895                        /* transfer all/some fifo data */
 896                        writel(req->req.dma, &dma->dmaaddr);
 897                        tmp = min(tmp, req->req.length);
 898
 899                        /* dma irq, faking scatterlist status */
 900                        req->td->dmacount = cpu_to_le32(req->req.length - tmp);
 901                        writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
 902                                        &dma->dmacount);
 903                        req->td->dmadesc = 0;
 904                        req->valid = 1;
 905
 906                        writel(BIT(DMA_ENABLE), &dma->dmactl);
 907                        writel(BIT(DMA_START), &dma->dmastat);
 908                        return;
 909                }
 910        }
 911
 912        tmp = dmactl_default;
 913
 914        /* force packet boundaries between dma requests, but prevent the
 915         * controller from automagically writing a last "short" packet
 916         * (zero length) unless the driver explicitly said to do that.
 917         */
 918        if (ep->is_in) {
 919                if (likely((req->req.length % ep->ep.maxpacket) ||
 920                                                        req->req.zero)){
 921                        tmp |= BIT(DMA_FIFO_VALIDATE);
 922                        ep->in_fifo_validate = 1;
 923                } else
 924                        ep->in_fifo_validate = 0;
 925        }
 926
 927        /* init req->td, pointing to the current dummy */
 928        req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 929        fill_dma_desc(ep, req, 1);
 930
 931        req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
 932
 933        start_queue(ep, tmp, req->td_dma);
 934}
 935
 936static inline void
 937queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 938{
 939        struct net2280_dma      *end;
 940        dma_addr_t              tmp;
 941
 942        /* swap new dummy for old, link; fill and maybe activate */
 943        end = ep->dummy;
 944        ep->dummy = req->td;
 945        req->td = end;
 946
 947        tmp = ep->td_dma;
 948        ep->td_dma = req->td_dma;
 949        req->td_dma = tmp;
 950
 951        end->dmadesc = cpu_to_le32 (ep->td_dma);
 952
 953        fill_dma_desc(ep, req, valid);
 954}
 955
 956static void
 957done(struct net2280_ep *ep, struct net2280_request *req, int status)
 958{
 959        struct net2280          *dev;
 960        unsigned                stopped = ep->stopped;
 961
 962        list_del_init(&req->queue);
 963
 964        if (req->req.status == -EINPROGRESS)
 965                req->req.status = status;
 966        else
 967                status = req->req.status;
 968
 969        dev = ep->dev;
 970        if (ep->dma)
 971                usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 972
 973        if (status && status != -ESHUTDOWN)
 974                ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 975                        ep->ep.name, &req->req, status,
 976                        req->req.actual, req->req.length);
 977
 978        /* don't modify queue heads during completion callback */
 979        ep->stopped = 1;
 980        spin_unlock(&dev->lock);
 981        usb_gadget_giveback_request(&ep->ep, &req->req);
 982        spin_lock(&dev->lock);
 983        ep->stopped = stopped;
 984}
 985
 986/*-------------------------------------------------------------------------*/
 987
 988static int
 989net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 990{
 991        struct net2280_request  *req;
 992        struct net2280_ep       *ep;
 993        struct net2280          *dev;
 994        unsigned long           flags;
 995        int ret = 0;
 996
 997        /* we always require a cpu-view buffer, so that we can
 998         * always use pio (as fallback or whatever).
 999         */
1000        ep = container_of(_ep, struct net2280_ep, ep);
1001        if (!_ep || (!ep->desc && ep->num != 0)) {
1002                pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1003                return -EINVAL;
1004        }
1005        req = container_of(_req, struct net2280_request, req);
1006        if (!_req || !_req->complete || !_req->buf ||
1007                                !list_empty(&req->queue)) {
1008                ret = -EINVAL;
1009                goto print_err;
1010        }
1011        if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1012                ret = -EDOM;
1013                goto print_err;
1014        }
1015        dev = ep->dev;
1016        if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1017                ret = -ESHUTDOWN;
1018                goto print_err;
1019        }
1020
1021        /* FIXME implement PIO fallback for ZLPs with DMA */
1022        if (ep->dma && _req->length == 0) {
1023                ret = -EOPNOTSUPP;
1024                goto print_err;
1025        }
1026
1027        /* set up dma mapping in case the caller didn't */
1028        if (ep->dma) {
1029                ret = usb_gadget_map_request(&dev->gadget, _req,
1030                                ep->is_in);
1031                if (ret)
1032                        goto print_err;
1033        }
1034
1035        ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1036                        _ep->name, _req, _req->length, _req->buf);
1037
1038        spin_lock_irqsave(&dev->lock, flags);
1039
1040        _req->status = -EINPROGRESS;
1041        _req->actual = 0;
1042
1043        /* kickstart this i/o queue? */
1044        if  (list_empty(&ep->queue) && !ep->stopped &&
1045                !((dev->quirks & PLX_PCIE) && ep->dma &&
1046                  (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1047
1048                /* use DMA if the endpoint supports it, else pio */
1049                if (ep->dma)
1050                        start_dma(ep, req);
1051                else {
1052                        /* maybe there's no control data, just status ack */
1053                        if (ep->num == 0 && _req->length == 0) {
1054                                allow_status(ep);
1055                                done(ep, req, 0);
1056                                ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1057                                goto done;
1058                        }
1059
1060                        /* PIO ... stuff the fifo, or unblock it.  */
1061                        if (ep->is_in)
1062                                write_fifo(ep, _req);
1063                        else if (list_empty(&ep->queue)) {
1064                                u32     s;
1065
1066                                /* OUT FIFO might have packet(s) buffered */
1067                                s = readl(&ep->regs->ep_stat);
1068                                if ((s & BIT(FIFO_EMPTY)) == 0) {
1069                                        /* note:  _req->short_not_ok is
1070                                         * ignored here since PIO _always_
1071                                         * stops queue advance here, and
1072                                         * _req->status doesn't change for
1073                                         * short reads (only _req->actual)
1074                                         */
1075                                        if (read_fifo(ep, req) &&
1076                                                        ep->num == 0) {
1077                                                done(ep, req, 0);
1078                                                allow_status(ep);
1079                                                /* don't queue it */
1080                                                req = NULL;
1081                                        } else if (read_fifo(ep, req) &&
1082                                                        ep->num != 0) {
1083                                                done(ep, req, 0);
1084                                                req = NULL;
1085                                        } else
1086                                                s = readl(&ep->regs->ep_stat);
1087                                }
1088
1089                                /* don't NAK, let the fifo fill */
1090                                if (req && (s & BIT(NAK_OUT_PACKETS)))
1091                                        writel(BIT(CLEAR_NAK_OUT_PACKETS),
1092                                                        &ep->regs->ep_rsp);
1093                        }
1094                }
1095
1096        } else if (ep->dma) {
1097                int     valid = 1;
1098
1099                if (ep->is_in) {
1100                        int     expect;
1101
1102                        /* preventing magic zlps is per-engine state, not
1103                         * per-transfer; irq logic must recover hiccups.
1104                         */
1105                        expect = likely(req->req.zero ||
1106                                (req->req.length % ep->ep.maxpacket));
1107                        if (expect != ep->in_fifo_validate)
1108                                valid = 0;
1109                }
1110                queue_dma(ep, req, valid);
1111
1112        } /* else the irq handler advances the queue. */
1113
1114        ep->responded = 1;
1115        if (req)
1116                list_add_tail(&req->queue, &ep->queue);
1117done:
1118        spin_unlock_irqrestore(&dev->lock, flags);
1119
1120        /* pci writes may still be posted */
1121        return ret;
1122
1123print_err:
1124        dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1125        return ret;
1126}
1127
1128static inline void
1129dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1130                int status)
1131{
1132        req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1133        done(ep, req, status);
1134}
1135
1136static int scan_dma_completions(struct net2280_ep *ep)
1137{
1138        int num_completed = 0;
1139
1140        /* only look at descriptors that were "naturally" retired,
1141         * so fifo and list head state won't matter
1142         */
1143        while (!list_empty(&ep->queue)) {
1144                struct net2280_request  *req;
1145                u32 req_dma_count;
1146
1147                req = list_entry(ep->queue.next,
1148                                struct net2280_request, queue);
1149                if (!req->valid)
1150                        break;
1151                rmb();
1152                req_dma_count = le32_to_cpup(&req->td->dmacount);
1153                if ((req_dma_count & BIT(VALID_BIT)) != 0)
1154                        break;
1155
1156                /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1157                 * cases where DMA must be aborted; this code handles
1158                 * all non-abort DMA completions.
1159                 */
1160                if (unlikely(req->td->dmadesc == 0)) {
1161                        /* paranoia */
1162                        u32 const ep_dmacount = readl(&ep->dma->dmacount);
1163
1164                        if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1165                                break;
1166                        /* single transfer mode */
1167                        dma_done(ep, req, req_dma_count, 0);
1168                        num_completed++;
1169                        break;
1170                } else if (!ep->is_in &&
1171                           (req->req.length % ep->ep.maxpacket) &&
1172                           !(ep->dev->quirks & PLX_PCIE)) {
1173
1174                        u32 const ep_stat = readl(&ep->regs->ep_stat);
1175                        /* AVOID TROUBLE HERE by not issuing short reads from
1176                         * your gadget driver.  That helps avoids errata 0121,
1177                         * 0122, and 0124; not all cases trigger the warning.
1178                         */
1179                        if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1180                                ep_warn(ep->dev, "%s lost packet sync!\n",
1181                                                ep->ep.name);
1182                                req->req.status = -EOVERFLOW;
1183                        } else {
1184                                u32 const ep_avail = readl(&ep->regs->ep_avail);
1185                                if (ep_avail) {
1186                                        /* fifo gets flushed later */
1187                                        ep->out_overflow = 1;
1188                                        ep_dbg(ep->dev,
1189                                                "%s dma, discard %d len %d\n",
1190                                                ep->ep.name, ep_avail,
1191                                                req->req.length);
1192                                        req->req.status = -EOVERFLOW;
1193                                }
1194                        }
1195                }
1196                dma_done(ep, req, req_dma_count, 0);
1197                num_completed++;
1198        }
1199
1200        return num_completed;
1201}
1202
1203static void restart_dma(struct net2280_ep *ep)
1204{
1205        struct net2280_request  *req;
1206
1207        if (ep->stopped)
1208                return;
1209        req = list_entry(ep->queue.next, struct net2280_request, queue);
1210
1211        start_dma(ep, req);
1212}
1213
1214static void abort_dma(struct net2280_ep *ep)
1215{
1216        /* abort the current transfer */
1217        if (likely(!list_empty(&ep->queue))) {
1218                /* FIXME work around errata 0121, 0122, 0124 */
1219                writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1220                spin_stop_dma(ep->dma);
1221        } else
1222                stop_dma(ep->dma);
1223        scan_dma_completions(ep);
1224}
1225
1226/* dequeue ALL requests */
1227static void nuke(struct net2280_ep *ep)
1228{
1229        struct net2280_request  *req;
1230
1231        /* called with spinlock held */
1232        ep->stopped = 1;
1233        if (ep->dma)
1234                abort_dma(ep);
1235        while (!list_empty(&ep->queue)) {
1236                req = list_entry(ep->queue.next,
1237                                struct net2280_request,
1238                                queue);
1239                done(ep, req, -ESHUTDOWN);
1240        }
1241}
1242
1243/* dequeue JUST ONE request */
1244static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1245{
1246        struct net2280_ep       *ep;
1247        struct net2280_request  *req;
1248        unsigned long           flags;
1249        u32                     dmactl;
1250        int                     stopped;
1251
1252        ep = container_of(_ep, struct net2280_ep, ep);
1253        if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1254                pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1255                                                __func__, _ep, _req);
1256                return -EINVAL;
1257        }
1258
1259        spin_lock_irqsave(&ep->dev->lock, flags);
1260        stopped = ep->stopped;
1261
1262        /* quiesce dma while we patch the queue */
1263        dmactl = 0;
1264        ep->stopped = 1;
1265        if (ep->dma) {
1266                dmactl = readl(&ep->dma->dmactl);
1267                /* WARNING erratum 0127 may kick in ... */
1268                stop_dma(ep->dma);
1269                scan_dma_completions(ep);
1270        }
1271
1272        /* make sure it's still queued on this endpoint */
1273        list_for_each_entry(req, &ep->queue, queue) {
1274                if (&req->req == _req)
1275                        break;
1276        }
1277        if (&req->req != _req) {
1278                spin_unlock_irqrestore(&ep->dev->lock, flags);
1279                dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1280                                                                __func__);
1281                return -EINVAL;
1282        }
1283
1284        /* queue head may be partially complete. */
1285        if (ep->queue.next == &req->queue) {
1286                if (ep->dma) {
1287                        ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1288                        _req->status = -ECONNRESET;
1289                        abort_dma(ep);
1290                        if (likely(ep->queue.next == &req->queue)) {
1291                                /* NOTE: misreports single-transfer mode*/
1292                                req->td->dmacount = 0;  /* invalidate */
1293                                dma_done(ep, req,
1294                                        readl(&ep->dma->dmacount),
1295                                        -ECONNRESET);
1296                        }
1297                } else {
1298                        ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1299                        done(ep, req, -ECONNRESET);
1300                }
1301                req = NULL;
1302        }
1303
1304        if (req)
1305                done(ep, req, -ECONNRESET);
1306        ep->stopped = stopped;
1307
1308        if (ep->dma) {
1309                /* turn off dma on inactive queues */
1310                if (list_empty(&ep->queue))
1311                        stop_dma(ep->dma);
1312                else if (!ep->stopped) {
1313                        /* resume current request, or start new one */
1314                        if (req)
1315                                writel(dmactl, &ep->dma->dmactl);
1316                        else
1317                                start_dma(ep, list_entry(ep->queue.next,
1318                                        struct net2280_request, queue));
1319                }
1320        }
1321
1322        spin_unlock_irqrestore(&ep->dev->lock, flags);
1323        return 0;
1324}
1325
1326/*-------------------------------------------------------------------------*/
1327
1328static int net2280_fifo_status(struct usb_ep *_ep);
1329
1330static int
1331net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1332{
1333        struct net2280_ep       *ep;
1334        unsigned long           flags;
1335        int                     retval = 0;
1336
1337        ep = container_of(_ep, struct net2280_ep, ep);
1338        if (!_ep || (!ep->desc && ep->num != 0)) {
1339                pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1340                return -EINVAL;
1341        }
1342        if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1343                retval = -ESHUTDOWN;
1344                goto print_err;
1345        }
1346        if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1347                                                == USB_ENDPOINT_XFER_ISOC) {
1348                retval = -EINVAL;
1349                goto print_err;
1350        }
1351
1352        spin_lock_irqsave(&ep->dev->lock, flags);
1353        if (!list_empty(&ep->queue)) {
1354                retval = -EAGAIN;
1355                goto print_unlock;
1356        } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1357                retval = -EAGAIN;
1358                goto print_unlock;
1359        } else {
1360                ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1361                                value ? "set" : "clear",
1362                                wedged ? "wedge" : "halt");
1363                /* set/clear, then synch memory views with the device */
1364                if (value) {
1365                        if (ep->num == 0)
1366                                ep->dev->protocol_stall = 1;
1367                        else
1368                                set_halt(ep);
1369                        if (wedged)
1370                                ep->wedged = 1;
1371                } else {
1372                        clear_halt(ep);
1373                        if (ep->dev->quirks & PLX_PCIE &&
1374                                !list_empty(&ep->queue) && ep->td_dma)
1375                                        restart_dma(ep);
1376                        ep->wedged = 0;
1377                }
1378                (void) readl(&ep->regs->ep_rsp);
1379        }
1380        spin_unlock_irqrestore(&ep->dev->lock, flags);
1381
1382        return retval;
1383
1384print_unlock:
1385        spin_unlock_irqrestore(&ep->dev->lock, flags);
1386print_err:
1387        dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1388        return retval;
1389}
1390
1391static int net2280_set_halt(struct usb_ep *_ep, int value)
1392{
1393        return net2280_set_halt_and_wedge(_ep, value, 0);
1394}
1395
1396static int net2280_set_wedge(struct usb_ep *_ep)
1397{
1398        if (!_ep || _ep->name == ep0name) {
1399                pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1400                return -EINVAL;
1401        }
1402        return net2280_set_halt_and_wedge(_ep, 1, 1);
1403}
1404
1405static int net2280_fifo_status(struct usb_ep *_ep)
1406{
1407        struct net2280_ep       *ep;
1408        u32                     avail;
1409
1410        ep = container_of(_ep, struct net2280_ep, ep);
1411        if (!_ep || (!ep->desc && ep->num != 0)) {
1412                pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1413                return -ENODEV;
1414        }
1415        if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1416                dev_err(&ep->dev->pdev->dev,
1417                        "%s: Invalid driver=%p or speed=%d\n",
1418                        __func__, ep->dev->driver, ep->dev->gadget.speed);
1419                return -ESHUTDOWN;
1420        }
1421
1422        avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1423        if (avail > ep->fifo_size) {
1424                dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1425                return -EOVERFLOW;
1426        }
1427        if (ep->is_in)
1428                avail = ep->fifo_size - avail;
1429        return avail;
1430}
1431
1432static void net2280_fifo_flush(struct usb_ep *_ep)
1433{
1434        struct net2280_ep       *ep;
1435
1436        ep = container_of(_ep, struct net2280_ep, ep);
1437        if (!_ep || (!ep->desc && ep->num != 0)) {
1438                pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1439                return;
1440        }
1441        if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1442                dev_err(&ep->dev->pdev->dev,
1443                        "%s: Invalid driver=%p or speed=%d\n",
1444                        __func__, ep->dev->driver, ep->dev->gadget.speed);
1445                return;
1446        }
1447
1448        writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1449        (void) readl(&ep->regs->ep_rsp);
1450}
1451
1452static const struct usb_ep_ops net2280_ep_ops = {
1453        .enable         = net2280_enable,
1454        .disable        = net2280_disable,
1455
1456        .alloc_request  = net2280_alloc_request,
1457        .free_request   = net2280_free_request,
1458
1459        .queue          = net2280_queue,
1460        .dequeue        = net2280_dequeue,
1461
1462        .set_halt       = net2280_set_halt,
1463        .set_wedge      = net2280_set_wedge,
1464        .fifo_status    = net2280_fifo_status,
1465        .fifo_flush     = net2280_fifo_flush,
1466};
1467
1468/*-------------------------------------------------------------------------*/
1469
1470static int net2280_get_frame(struct usb_gadget *_gadget)
1471{
1472        struct net2280          *dev;
1473        unsigned long           flags;
1474        u16                     retval;
1475
1476        if (!_gadget)
1477                return -ENODEV;
1478        dev = container_of(_gadget, struct net2280, gadget);
1479        spin_lock_irqsave(&dev->lock, flags);
1480        retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1481        spin_unlock_irqrestore(&dev->lock, flags);
1482        return retval;
1483}
1484
1485static int net2280_wakeup(struct usb_gadget *_gadget)
1486{
1487        struct net2280          *dev;
1488        u32                     tmp;
1489        unsigned long           flags;
1490
1491        if (!_gadget)
1492                return 0;
1493        dev = container_of(_gadget, struct net2280, gadget);
1494
1495        spin_lock_irqsave(&dev->lock, flags);
1496        tmp = readl(&dev->usb->usbctl);
1497        if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1498                writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1499        spin_unlock_irqrestore(&dev->lock, flags);
1500
1501        /* pci writes may still be posted */
1502        return 0;
1503}
1504
1505static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1506{
1507        struct net2280          *dev;
1508        u32                     tmp;
1509        unsigned long           flags;
1510
1511        if (!_gadget)
1512                return 0;
1513        dev = container_of(_gadget, struct net2280, gadget);
1514
1515        spin_lock_irqsave(&dev->lock, flags);
1516        tmp = readl(&dev->usb->usbctl);
1517        if (value) {
1518                tmp |= BIT(SELF_POWERED_STATUS);
1519                _gadget->is_selfpowered = 1;
1520        } else {
1521                tmp &= ~BIT(SELF_POWERED_STATUS);
1522                _gadget->is_selfpowered = 0;
1523        }
1524        writel(tmp, &dev->usb->usbctl);
1525        spin_unlock_irqrestore(&dev->lock, flags);
1526
1527        return 0;
1528}
1529
1530static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1531{
1532        struct net2280  *dev;
1533        u32             tmp;
1534        unsigned long   flags;
1535
1536        if (!_gadget)
1537                return -ENODEV;
1538        dev = container_of(_gadget, struct net2280, gadget);
1539
1540        spin_lock_irqsave(&dev->lock, flags);
1541        tmp = readl(&dev->usb->usbctl);
1542        dev->softconnect = (is_on != 0);
1543        if (is_on) {
1544                ep0_start(dev);
1545                writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1546        } else {
1547                writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1548                stop_activity(dev, NULL);
1549        }
1550
1551        spin_unlock_irqrestore(&dev->lock, flags);
1552
1553        return 0;
1554}
1555
1556static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1557                struct usb_endpoint_descriptor *desc,
1558                struct usb_ss_ep_comp_descriptor *ep_comp)
1559{
1560        char name[8];
1561        struct usb_ep *ep;
1562
1563        if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1564                /* ep-e, ep-f are PIO with only 64 byte fifos */
1565                ep = gadget_find_ep_by_name(_gadget, "ep-e");
1566                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1567                        return ep;
1568                ep = gadget_find_ep_by_name(_gadget, "ep-f");
1569                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1570                        return ep;
1571        }
1572
1573        /* USB3380: Only first four endpoints have DMA channels. Allocate
1574         * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1575         * endpoints use DMA hw endpoints.
1576         */
1577        if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1578            usb_endpoint_dir_in(desc)) {
1579                ep = gadget_find_ep_by_name(_gadget, "ep2in");
1580                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1581                        return ep;
1582                ep = gadget_find_ep_by_name(_gadget, "ep4in");
1583                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1584                        return ep;
1585        } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1586                   !usb_endpoint_dir_in(desc)) {
1587                ep = gadget_find_ep_by_name(_gadget, "ep1out");
1588                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1589                        return ep;
1590                ep = gadget_find_ep_by_name(_gadget, "ep3out");
1591                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1592                        return ep;
1593        } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1594                   usb_endpoint_dir_in(desc)) {
1595                ep = gadget_find_ep_by_name(_gadget, "ep1in");
1596                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1597                        return ep;
1598                ep = gadget_find_ep_by_name(_gadget, "ep3in");
1599                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1600                        return ep;
1601        } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1602                   !usb_endpoint_dir_in(desc)) {
1603                ep = gadget_find_ep_by_name(_gadget, "ep2out");
1604                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1605                        return ep;
1606                ep = gadget_find_ep_by_name(_gadget, "ep4out");
1607                if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1608                        return ep;
1609        }
1610
1611        /* USB3380: use same address for usb and hardware endpoints */
1612        snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1613                        usb_endpoint_dir_in(desc) ? "in" : "out");
1614        ep = gadget_find_ep_by_name(_gadget, name);
1615        if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1616                return ep;
1617
1618        return NULL;
1619}
1620
1621static int net2280_start(struct usb_gadget *_gadget,
1622                struct usb_gadget_driver *driver);
1623static int net2280_stop(struct usb_gadget *_gadget);
1624
1625static const struct usb_gadget_ops net2280_ops = {
1626        .get_frame      = net2280_get_frame,
1627        .wakeup         = net2280_wakeup,
1628        .set_selfpowered = net2280_set_selfpowered,
1629        .pullup         = net2280_pullup,
1630        .udc_start      = net2280_start,
1631        .udc_stop       = net2280_stop,
1632        .match_ep       = net2280_match_ep,
1633};
1634
1635/*-------------------------------------------------------------------------*/
1636
1637#ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1638
1639/* FIXME move these into procfs, and use seq_file.
1640 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1641 * and also doesn't help products using this with 2.4 kernels.
1642 */
1643
1644/* "function" sysfs attribute */
1645static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1646                             char *buf)
1647{
1648        struct net2280  *dev = dev_get_drvdata(_dev);
1649
1650        if (!dev->driver || !dev->driver->function ||
1651                        strlen(dev->driver->function) > PAGE_SIZE)
1652                return 0;
1653        return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1654}
1655static DEVICE_ATTR_RO(function);
1656
1657static ssize_t registers_show(struct device *_dev,
1658                              struct device_attribute *attr, char *buf)
1659{
1660        struct net2280          *dev;
1661        char                    *next;
1662        unsigned                size, t;
1663        unsigned long           flags;
1664        int                     i;
1665        u32                     t1, t2;
1666        const char              *s;
1667
1668        dev = dev_get_drvdata(_dev);
1669        next = buf;
1670        size = PAGE_SIZE;
1671        spin_lock_irqsave(&dev->lock, flags);
1672
1673        if (dev->driver)
1674                s = dev->driver->driver.name;
1675        else
1676                s = "(none)";
1677
1678        /* Main Control Registers */
1679        t = scnprintf(next, size, "%s version " DRIVER_VERSION
1680                        ", chiprev %04x\n\n"
1681                        "devinit %03x fifoctl %08x gadget '%s'\n"
1682                        "pci irqenb0 %02x irqenb1 %08x "
1683                        "irqstat0 %04x irqstat1 %08x\n",
1684                        driver_name, dev->chiprev,
1685                        readl(&dev->regs->devinit),
1686                        readl(&dev->regs->fifoctl),
1687                        s,
1688                        readl(&dev->regs->pciirqenb0),
1689                        readl(&dev->regs->pciirqenb1),
1690                        readl(&dev->regs->irqstat0),
1691                        readl(&dev->regs->irqstat1));
1692        size -= t;
1693        next += t;
1694
1695        /* USB Control Registers */
1696        t1 = readl(&dev->usb->usbctl);
1697        t2 = readl(&dev->usb->usbstat);
1698        if (t1 & BIT(VBUS_PIN)) {
1699                if (t2 & BIT(HIGH_SPEED))
1700                        s = "high speed";
1701                else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1702                        s = "powered";
1703                else
1704                        s = "full speed";
1705                /* full speed bit (6) not working?? */
1706        } else
1707                        s = "not attached";
1708        t = scnprintf(next, size,
1709                        "stdrsp %08x usbctl %08x usbstat %08x "
1710                                "addr 0x%02x (%s)\n",
1711                        readl(&dev->usb->stdrsp), t1, t2,
1712                        readl(&dev->usb->ouraddr), s);
1713        size -= t;
1714        next += t;
1715
1716        /* PCI Master Control Registers */
1717
1718        /* DMA Control Registers */
1719
1720        /* Configurable EP Control Registers */
1721        for (i = 0; i < dev->n_ep; i++) {
1722                struct net2280_ep       *ep;
1723
1724                ep = &dev->ep[i];
1725                if (i && !ep->desc)
1726                        continue;
1727
1728                t1 = readl(&ep->cfg->ep_cfg);
1729                t2 = readl(&ep->regs->ep_rsp) & 0xff;
1730                t = scnprintf(next, size,
1731                                "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1732                                        "irqenb %02x\n",
1733                                ep->ep.name, t1, t2,
1734                                (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1735                                        ? "NAK " : "",
1736                                (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1737                                        ? "hide " : "",
1738                                (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1739                                        ? "CRC " : "",
1740                                (t2 & BIT(CLEAR_INTERRUPT_MODE))
1741                                        ? "interrupt " : "",
1742                                (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1743                                        ? "status " : "",
1744                                (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1745                                        ? "NAKmode " : "",
1746                                (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1747                                        ? "DATA1 " : "DATA0 ",
1748                                (t2 & BIT(CLEAR_ENDPOINT_HALT))
1749                                        ? "HALT " : "",
1750                                readl(&ep->regs->ep_irqenb));
1751                size -= t;
1752                next += t;
1753
1754                t = scnprintf(next, size,
1755                                "\tstat %08x avail %04x "
1756                                "(ep%d%s-%s)%s\n",
1757                                readl(&ep->regs->ep_stat),
1758                                readl(&ep->regs->ep_avail),
1759                                t1 & 0x0f, DIR_STRING(t1),
1760                                type_string(t1 >> 8),
1761                                ep->stopped ? "*" : "");
1762                size -= t;
1763                next += t;
1764
1765                if (!ep->dma)
1766                        continue;
1767
1768                t = scnprintf(next, size,
1769                                "  dma\tctl %08x stat %08x count %08x\n"
1770                                "\taddr %08x desc %08x\n",
1771                                readl(&ep->dma->dmactl),
1772                                readl(&ep->dma->dmastat),
1773                                readl(&ep->dma->dmacount),
1774                                readl(&ep->dma->dmaaddr),
1775                                readl(&ep->dma->dmadesc));
1776                size -= t;
1777                next += t;
1778
1779        }
1780
1781        /* Indexed Registers (none yet) */
1782
1783        /* Statistics */
1784        t = scnprintf(next, size, "\nirqs:  ");
1785        size -= t;
1786        next += t;
1787        for (i = 0; i < dev->n_ep; i++) {
1788                struct net2280_ep       *ep;
1789
1790                ep = &dev->ep[i];
1791                if (i && !ep->irqs)
1792                        continue;
1793                t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1794                size -= t;
1795                next += t;
1796
1797        }
1798        t = scnprintf(next, size, "\n");
1799        size -= t;
1800        next += t;
1801
1802        spin_unlock_irqrestore(&dev->lock, flags);
1803
1804        return PAGE_SIZE - size;
1805}
1806static DEVICE_ATTR_RO(registers);
1807
1808static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1809                           char *buf)
1810{
1811        struct net2280          *dev;
1812        char                    *next;
1813        unsigned                size;
1814        unsigned long           flags;
1815        int                     i;
1816
1817        dev = dev_get_drvdata(_dev);
1818        next = buf;
1819        size = PAGE_SIZE;
1820        spin_lock_irqsave(&dev->lock, flags);
1821
1822        for (i = 0; i < dev->n_ep; i++) {
1823                struct net2280_ep               *ep = &dev->ep[i];
1824                struct net2280_request          *req;
1825                int                             t;
1826
1827                if (i != 0) {
1828                        const struct usb_endpoint_descriptor    *d;
1829
1830                        d = ep->desc;
1831                        if (!d)
1832                                continue;
1833                        t = d->bEndpointAddress;
1834                        t = scnprintf(next, size,
1835                                "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1836                                ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1837                                (t & USB_DIR_IN) ? "in" : "out",
1838                                type_string(d->bmAttributes),
1839                                usb_endpoint_maxp(d),
1840                                ep->dma ? "dma" : "pio", ep->fifo_size
1841                                );
1842                } else /* ep0 should only have one transfer queued */
1843                        t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1844                                        ep->is_in ? "in" : "out");
1845                if (t <= 0 || t > size)
1846                        goto done;
1847                size -= t;
1848                next += t;
1849
1850                if (list_empty(&ep->queue)) {
1851                        t = scnprintf(next, size, "\t(nothing queued)\n");
1852                        if (t <= 0 || t > size)
1853                                goto done;
1854                        size -= t;
1855                        next += t;
1856                        continue;
1857                }
1858                list_for_each_entry(req, &ep->queue, queue) {
1859                        if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1860                                t = scnprintf(next, size,
1861                                        "\treq %p len %d/%d "
1862                                        "buf %p (dmacount %08x)\n",
1863                                        &req->req, req->req.actual,
1864                                        req->req.length, req->req.buf,
1865                                        readl(&ep->dma->dmacount));
1866                        else
1867                                t = scnprintf(next, size,
1868                                        "\treq %p len %d/%d buf %p\n",
1869                                        &req->req, req->req.actual,
1870                                        req->req.length, req->req.buf);
1871                        if (t <= 0 || t > size)
1872                                goto done;
1873                        size -= t;
1874                        next += t;
1875
1876                        if (ep->dma) {
1877                                struct net2280_dma      *td;
1878
1879                                td = req->td;
1880                                t = scnprintf(next, size, "\t    td %08x "
1881                                        " count %08x buf %08x desc %08x\n",
1882                                        (u32) req->td_dma,
1883                                        le32_to_cpu(td->dmacount),
1884                                        le32_to_cpu(td->dmaaddr),
1885                                        le32_to_cpu(td->dmadesc));
1886                                if (t <= 0 || t > size)
1887                                        goto done;
1888                                size -= t;
1889                                next += t;
1890                        }
1891                }
1892        }
1893
1894done:
1895        spin_unlock_irqrestore(&dev->lock, flags);
1896        return PAGE_SIZE - size;
1897}
1898static DEVICE_ATTR_RO(queues);
1899
1900
1901#else
1902
1903#define device_create_file(a, b)        (0)
1904#define device_remove_file(a, b)        do { } while (0)
1905
1906#endif
1907
1908/*-------------------------------------------------------------------------*/
1909
1910/* another driver-specific mode might be a request type doing dma
1911 * to/from another device fifo instead of to/from memory.
1912 */
1913
1914static void set_fifo_mode(struct net2280 *dev, int mode)
1915{
1916        /* keeping high bits preserves BAR2 */
1917        writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1918
1919        /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1920        INIT_LIST_HEAD(&dev->gadget.ep_list);
1921        list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1922        list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1923        switch (mode) {
1924        case 0:
1925                list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1926                list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1927                dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1928                break;
1929        case 1:
1930                dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1931                break;
1932        case 2:
1933                list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1934                dev->ep[1].fifo_size = 2048;
1935                dev->ep[2].fifo_size = 1024;
1936                break;
1937        }
1938        /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1939        list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1940        list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1941}
1942
1943static void defect7374_disable_data_eps(struct net2280 *dev)
1944{
1945        /*
1946         * For Defect 7374, disable data EPs (and more):
1947         *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1948         *    returing ep regs back to normal.
1949         */
1950        struct net2280_ep *ep;
1951        int i;
1952        unsigned char ep_sel;
1953        u32 tmp_reg;
1954
1955        for (i = 1; i < 5; i++) {
1956                ep = &dev->ep[i];
1957                writel(i, &ep->cfg->ep_cfg);
1958        }
1959
1960        /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1961        for (i = 0; i < 6; i++)
1962                writel(0, &dev->dep[i].dep_cfg);
1963
1964        for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1965                /* Select an endpoint for subsequent operations: */
1966                tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1967                writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1968
1969                if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1970                                        ep_sel == 18 || ep_sel == 20)
1971                        continue;
1972
1973                /* Change settings on some selected endpoints */
1974                tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1975                tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1976                writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1977                tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1978                tmp_reg |= BIT(EP_INITIALIZED);
1979                writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1980        }
1981}
1982
1983static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1984{
1985        u32 tmp = 0, tmp_reg;
1986        u32 scratch;
1987        int i;
1988        unsigned char ep_sel;
1989
1990        scratch = get_idx_reg(dev->regs, SCRATCH);
1991
1992        WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1993                == DEFECT7374_FSM_SS_CONTROL_READ);
1994
1995        scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1996
1997        ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1998        ep_warn(dev, "It will operate on cold-reboot and SS connect");
1999
2000        /*GPEPs:*/
2001        tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2002                        (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2003                        ((dev->enhanced_mode) ?
2004                         BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2005                         BIT(ENDPOINT_ENABLE)));
2006
2007        for (i = 1; i < 5; i++)
2008                writel(tmp, &dev->ep[i].cfg->ep_cfg);
2009
2010        /* CSRIN, PCIIN, STATIN, RCIN*/
2011        tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2012        writel(tmp, &dev->dep[1].dep_cfg);
2013        writel(tmp, &dev->dep[3].dep_cfg);
2014        writel(tmp, &dev->dep[4].dep_cfg);
2015        writel(tmp, &dev->dep[5].dep_cfg);
2016
2017        /*Implemented for development and debug.
2018         * Can be refined/tuned later.*/
2019        for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2020                /* Select an endpoint for subsequent operations: */
2021                tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2022                writel(((tmp_reg & ~0x1f) | ep_sel),
2023                                &dev->plregs->pl_ep_ctrl);
2024
2025                if (ep_sel == 1) {
2026                        tmp =
2027                                (readl(&dev->plregs->pl_ep_ctrl) |
2028                                 BIT(CLEAR_ACK_ERROR_CODE) | 0);
2029                        writel(tmp, &dev->plregs->pl_ep_ctrl);
2030                        continue;
2031                }
2032
2033                if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2034                                ep_sel == 18  || ep_sel == 20)
2035                        continue;
2036
2037                tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2038                                BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2039                writel(tmp, &dev->plregs->pl_ep_cfg_4);
2040
2041                tmp = readl(&dev->plregs->pl_ep_ctrl) &
2042                        ~BIT(EP_INITIALIZED);
2043                writel(tmp, &dev->plregs->pl_ep_ctrl);
2044
2045        }
2046
2047        /* Set FSM to focus on the first Control Read:
2048         * - Tip: Connection speed is known upon the first
2049         * setup request.*/
2050        scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2051        set_idx_reg(dev->regs, SCRATCH, scratch);
2052
2053}
2054
2055/* keeping it simple:
2056 * - one bus driver, initted first;
2057 * - one function driver, initted second
2058 *
2059 * most of the work to support multiple net2280 controllers would
2060 * be to associate this gadget driver (yes?) with all of them, or
2061 * perhaps to bind specific drivers to specific devices.
2062 */
2063
2064static void usb_reset_228x(struct net2280 *dev)
2065{
2066        u32     tmp;
2067
2068        dev->gadget.speed = USB_SPEED_UNKNOWN;
2069        (void) readl(&dev->usb->usbctl);
2070
2071        net2280_led_init(dev);
2072
2073        /* disable automatic responses, and irqs */
2074        writel(0, &dev->usb->stdrsp);
2075        writel(0, &dev->regs->pciirqenb0);
2076        writel(0, &dev->regs->pciirqenb1);
2077
2078        /* clear old dma and irq state */
2079        for (tmp = 0; tmp < 4; tmp++) {
2080                struct net2280_ep       *ep = &dev->ep[tmp + 1];
2081                if (ep->dma)
2082                        abort_dma(ep);
2083        }
2084
2085        writel(~0, &dev->regs->irqstat0),
2086        writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2087
2088        /* reset, and enable pci */
2089        tmp = readl(&dev->regs->devinit) |
2090                BIT(PCI_ENABLE) |
2091                BIT(FIFO_SOFT_RESET) |
2092                BIT(USB_SOFT_RESET) |
2093                BIT(M8051_RESET);
2094        writel(tmp, &dev->regs->devinit);
2095
2096        /* standard fifo and endpoint allocations */
2097        set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2098}
2099
2100static void usb_reset_338x(struct net2280 *dev)
2101{
2102        u32 tmp;
2103
2104        dev->gadget.speed = USB_SPEED_UNKNOWN;
2105        (void)readl(&dev->usb->usbctl);
2106
2107        net2280_led_init(dev);
2108
2109        if (dev->bug7734_patched) {
2110                /* disable automatic responses, and irqs */
2111                writel(0, &dev->usb->stdrsp);
2112                writel(0, &dev->regs->pciirqenb0);
2113                writel(0, &dev->regs->pciirqenb1);
2114        }
2115
2116        /* clear old dma and irq state */
2117        for (tmp = 0; tmp < 4; tmp++) {
2118                struct net2280_ep *ep = &dev->ep[tmp + 1];
2119                struct net2280_dma_regs __iomem *dma;
2120
2121                if (ep->dma) {
2122                        abort_dma(ep);
2123                } else {
2124                        dma = &dev->dma[tmp];
2125                        writel(BIT(DMA_ABORT), &dma->dmastat);
2126                        writel(0, &dma->dmactl);
2127                }
2128        }
2129
2130        writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2131
2132        if (dev->bug7734_patched) {
2133                /* reset, and enable pci */
2134                tmp = readl(&dev->regs->devinit) |
2135                    BIT(PCI_ENABLE) |
2136                    BIT(FIFO_SOFT_RESET) |
2137                    BIT(USB_SOFT_RESET) |
2138                    BIT(M8051_RESET);
2139
2140                writel(tmp, &dev->regs->devinit);
2141        }
2142
2143        /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2144        INIT_LIST_HEAD(&dev->gadget.ep_list);
2145
2146        for (tmp = 1; tmp < dev->n_ep; tmp++)
2147                list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2148
2149}
2150
2151static void usb_reset(struct net2280 *dev)
2152{
2153        if (dev->quirks & PLX_LEGACY)
2154                return usb_reset_228x(dev);
2155        return usb_reset_338x(dev);
2156}
2157
2158static void usb_reinit_228x(struct net2280 *dev)
2159{
2160        u32     tmp;
2161
2162        /* basic endpoint init */
2163        for (tmp = 0; tmp < 7; tmp++) {
2164                struct net2280_ep       *ep = &dev->ep[tmp];
2165
2166                ep->ep.name = ep_info_dft[tmp].name;
2167                ep->ep.caps = ep_info_dft[tmp].caps;
2168                ep->dev = dev;
2169                ep->num = tmp;
2170
2171                if (tmp > 0 && tmp <= 4) {
2172                        ep->fifo_size = 1024;
2173                        ep->dma = &dev->dma[tmp - 1];
2174                } else
2175                        ep->fifo_size = 64;
2176                ep->regs = &dev->epregs[tmp];
2177                ep->cfg = &dev->epregs[tmp];
2178                ep_reset_228x(dev->regs, ep);
2179        }
2180        usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2181        usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2182        usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2183
2184        dev->gadget.ep0 = &dev->ep[0].ep;
2185        dev->ep[0].stopped = 0;
2186        INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2187
2188        /* we want to prevent lowlevel/insecure access from the USB host,
2189         * but erratum 0119 means this enable bit is ignored
2190         */
2191        for (tmp = 0; tmp < 5; tmp++)
2192                writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2193}
2194
2195static void usb_reinit_338x(struct net2280 *dev)
2196{
2197        int i;
2198        u32 tmp, val;
2199        static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2200        static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2201                                                0x00, 0xC0, 0x00, 0xC0 };
2202
2203        /* basic endpoint init */
2204        for (i = 0; i < dev->n_ep; i++) {
2205                struct net2280_ep *ep = &dev->ep[i];
2206
2207                ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2208                                                   ep_info_dft[i].name;
2209                ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2210                                                   ep_info_dft[i].caps;
2211                ep->dev = dev;
2212                ep->num = i;
2213
2214                if (i > 0 && i <= 4)
2215                        ep->dma = &dev->dma[i - 1];
2216
2217                if (dev->enhanced_mode) {
2218                        ep->cfg = &dev->epregs[ne[i]];
2219                        /*
2220                         * Set USB endpoint number, hardware allows same number
2221                         * in both directions.
2222                         */
2223                         if (i > 0 && i < 5)
2224                                writel(ne[i], &ep->cfg->ep_cfg);
2225                        ep->regs = (struct net2280_ep_regs __iomem *)
2226                                (((void __iomem *)&dev->epregs[ne[i]]) +
2227                                ep_reg_addr[i]);
2228                } else {
2229                        ep->cfg = &dev->epregs[i];
2230                        ep->regs = &dev->epregs[i];
2231                }
2232
2233                ep->fifo_size = (i != 0) ? 2048 : 512;
2234
2235                ep_reset_338x(dev->regs, ep);
2236        }
2237        usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2238
2239        dev->gadget.ep0 = &dev->ep[0].ep;
2240        dev->ep[0].stopped = 0;
2241
2242        /* Link layer set up */
2243        if (dev->bug7734_patched) {
2244                tmp = readl(&dev->usb_ext->usbctl2) &
2245                    ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2246                writel(tmp, &dev->usb_ext->usbctl2);
2247        }
2248
2249        /* Hardware Defect and Workaround */
2250        val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2251        val &= ~(0xf << TIMER_LFPS_6US);
2252        val |= 0x5 << TIMER_LFPS_6US;
2253        writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2254
2255        val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2256        val &= ~(0xffff << TIMER_LFPS_80US);
2257        val |= 0x0100 << TIMER_LFPS_80US;
2258        writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2259
2260        /*
2261         * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2262         * Hot Reset Exit Handshake may Fail in Specific Case using
2263         * Default Register Settings. Workaround for Enumeration test.
2264         */
2265        val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2266        val &= ~(0x1f << HOT_TX_NORESET_TS2);
2267        val |= 0x10 << HOT_TX_NORESET_TS2;
2268        writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2269
2270        val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2271        val &= ~(0x1f << HOT_RX_RESET_TS2);
2272        val |= 0x3 << HOT_RX_RESET_TS2;
2273        writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2274
2275        /*
2276         * Set Recovery Idle to Recover bit:
2277         * - On SS connections, setting Recovery Idle to Recover Fmw improves
2278         *   link robustness with various hosts and hubs.
2279         * - It is safe to set for all connection speeds; all chip revisions.
2280         * - R-M-W to leave other bits undisturbed.
2281         * - Reference PLX TT-7372
2282        */
2283        val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2284        val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2285        writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2286
2287        INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2288
2289        /* disable dedicated endpoints */
2290        writel(0x0D, &dev->dep[0].dep_cfg);
2291        writel(0x0D, &dev->dep[1].dep_cfg);
2292        writel(0x0E, &dev->dep[2].dep_cfg);
2293        writel(0x0E, &dev->dep[3].dep_cfg);
2294        writel(0x0F, &dev->dep[4].dep_cfg);
2295        writel(0x0C, &dev->dep[5].dep_cfg);
2296}
2297
2298static void usb_reinit(struct net2280 *dev)
2299{
2300        if (dev->quirks & PLX_LEGACY)
2301                return usb_reinit_228x(dev);
2302        return usb_reinit_338x(dev);
2303}
2304
2305static void ep0_start_228x(struct net2280 *dev)
2306{
2307        writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2308                BIT(CLEAR_NAK_OUT_PACKETS) |
2309                BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2310                &dev->epregs[0].ep_rsp);
2311
2312        /*
2313         * hardware optionally handles a bunch of standard requests
2314         * that the API hides from drivers anyway.  have it do so.
2315         * endpoint status/features are handled in software, to
2316         * help pass tests for some dubious behavior.
2317         */
2318        writel(BIT(SET_TEST_MODE) |
2319                BIT(SET_ADDRESS) |
2320                BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2321                BIT(GET_DEVICE_STATUS) |
2322                BIT(GET_INTERFACE_STATUS),
2323                &dev->usb->stdrsp);
2324        writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2325                BIT(SELF_POWERED_USB_DEVICE) |
2326                BIT(REMOTE_WAKEUP_SUPPORT) |
2327                (dev->softconnect << USB_DETECT_ENABLE) |
2328                BIT(SELF_POWERED_STATUS),
2329                &dev->usb->usbctl);
2330
2331        /* enable irqs so we can see ep0 and general operation  */
2332        writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2333                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2334                &dev->regs->pciirqenb0);
2335        writel(BIT(PCI_INTERRUPT_ENABLE) |
2336                BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2337                BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2338                BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2339                BIT(VBUS_INTERRUPT_ENABLE) |
2340                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2341                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2342                &dev->regs->pciirqenb1);
2343
2344        /* don't leave any writes posted */
2345        (void) readl(&dev->usb->usbctl);
2346}
2347
2348static void ep0_start_338x(struct net2280 *dev)
2349{
2350
2351        if (dev->bug7734_patched)
2352                writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2353                       BIT(SET_EP_HIDE_STATUS_PHASE),
2354                       &dev->epregs[0].ep_rsp);
2355
2356        /*
2357         * hardware optionally handles a bunch of standard requests
2358         * that the API hides from drivers anyway.  have it do so.
2359         * endpoint status/features are handled in software, to
2360         * help pass tests for some dubious behavior.
2361         */
2362        writel(BIT(SET_ISOCHRONOUS_DELAY) |
2363               BIT(SET_SEL) |
2364               BIT(SET_TEST_MODE) |
2365               BIT(SET_ADDRESS) |
2366               BIT(GET_INTERFACE_STATUS) |
2367               BIT(GET_DEVICE_STATUS),
2368                &dev->usb->stdrsp);
2369        dev->wakeup_enable = 1;
2370        writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2371               (dev->softconnect << USB_DETECT_ENABLE) |
2372               BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2373               &dev->usb->usbctl);
2374
2375        /* enable irqs so we can see ep0 and general operation  */
2376        writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2377               BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2378               &dev->regs->pciirqenb0);
2379        writel(BIT(PCI_INTERRUPT_ENABLE) |
2380               BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2381               BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2382               BIT(VBUS_INTERRUPT_ENABLE),
2383               &dev->regs->pciirqenb1);
2384
2385        /* don't leave any writes posted */
2386        (void)readl(&dev->usb->usbctl);
2387}
2388
2389static void ep0_start(struct net2280 *dev)
2390{
2391        if (dev->quirks & PLX_LEGACY)
2392                return ep0_start_228x(dev);
2393        return ep0_start_338x(dev);
2394}
2395
2396/* when a driver is successfully registered, it will receive
2397 * control requests including set_configuration(), which enables
2398 * non-control requests.  then usb traffic follows until a
2399 * disconnect is reported.  then a host may connect again, or
2400 * the driver might get unbound.
2401 */
2402static int net2280_start(struct usb_gadget *_gadget,
2403                struct usb_gadget_driver *driver)
2404{
2405        struct net2280          *dev;
2406        int                     retval;
2407        unsigned                i;
2408
2409        /* insist on high speed support from the driver, since
2410         * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2411         * "must not be used in normal operation"
2412         */
2413        if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2414                        !driver->setup)
2415                return -EINVAL;
2416
2417        dev = container_of(_gadget, struct net2280, gadget);
2418
2419        for (i = 0; i < dev->n_ep; i++)
2420                dev->ep[i].irqs = 0;
2421
2422        /* hook up the driver ... */
2423        driver->driver.bus = NULL;
2424        dev->driver = driver;
2425
2426        retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2427        if (retval)
2428                goto err_unbind;
2429        retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2430        if (retval)
2431                goto err_func;
2432
2433        /* enable host detection and ep0; and we're ready
2434         * for set_configuration as well as eventual disconnect.
2435         */
2436        net2280_led_active(dev, 1);
2437
2438        if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2439                defect7374_enable_data_eps_zero(dev);
2440
2441        ep0_start(dev);
2442
2443        /* pci writes may still be posted */
2444        return 0;
2445
2446err_func:
2447        device_remove_file(&dev->pdev->dev, &dev_attr_function);
2448err_unbind:
2449        dev->driver = NULL;
2450        return retval;
2451}
2452
2453static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2454{
2455        int                     i;
2456
2457        /* don't disconnect if it's not connected */
2458        if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2459                driver = NULL;
2460
2461        /* stop hardware; prevent new request submissions;
2462         * and kill any outstanding requests.
2463         */
2464        usb_reset(dev);
2465        for (i = 0; i < dev->n_ep; i++)
2466                nuke(&dev->ep[i]);
2467
2468        /* report disconnect; the driver is already quiesced */
2469        if (driver) {
2470                spin_unlock(&dev->lock);
2471                driver->disconnect(&dev->gadget);
2472                spin_lock(&dev->lock);
2473        }
2474
2475        usb_reinit(dev);
2476}
2477
2478static int net2280_stop(struct usb_gadget *_gadget)
2479{
2480        struct net2280  *dev;
2481        unsigned long   flags;
2482
2483        dev = container_of(_gadget, struct net2280, gadget);
2484
2485        spin_lock_irqsave(&dev->lock, flags);
2486        stop_activity(dev, NULL);
2487        spin_unlock_irqrestore(&dev->lock, flags);
2488
2489        net2280_led_active(dev, 0);
2490
2491        device_remove_file(&dev->pdev->dev, &dev_attr_function);
2492        device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2493
2494        dev->driver = NULL;
2495
2496        return 0;
2497}
2498
2499/*-------------------------------------------------------------------------*/
2500
2501/* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2502 * also works for dma-capable endpoints, in pio mode or just
2503 * to manually advance the queue after short OUT transfers.
2504 */
2505static void handle_ep_small(struct net2280_ep *ep)
2506{
2507        struct net2280_request  *req;
2508        u32                     t;
2509        /* 0 error, 1 mid-data, 2 done */
2510        int                     mode = 1;
2511
2512        if (!list_empty(&ep->queue))
2513                req = list_entry(ep->queue.next,
2514                        struct net2280_request, queue);
2515        else
2516                req = NULL;
2517
2518        /* ack all, and handle what we care about */
2519        t = readl(&ep->regs->ep_stat);
2520        ep->irqs++;
2521
2522        ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2523                        ep->ep.name, t, req ? &req->req : NULL);
2524
2525        if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2526                writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2527        else
2528                /* Added for 2282 */
2529                writel(t, &ep->regs->ep_stat);
2530
2531        /* for ep0, monitor token irqs to catch data stage length errors
2532         * and to synchronize on status.
2533         *
2534         * also, to defer reporting of protocol stalls ... here's where
2535         * data or status first appears, handling stalls here should never
2536         * cause trouble on the host side..
2537         *
2538         * control requests could be slightly faster without token synch for
2539         * status, but status can jam up that way.
2540         */
2541        if (unlikely(ep->num == 0)) {
2542                if (ep->is_in) {
2543                        /* status; stop NAKing */
2544                        if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2545                                if (ep->dev->protocol_stall) {
2546                                        ep->stopped = 1;
2547                                        set_halt(ep);
2548                                }
2549                                if (!req)
2550                                        allow_status(ep);
2551                                mode = 2;
2552                        /* reply to extra IN data tokens with a zlp */
2553                        } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2554                                if (ep->dev->protocol_stall) {
2555                                        ep->stopped = 1;
2556                                        set_halt(ep);
2557                                        mode = 2;
2558                                } else if (ep->responded &&
2559                                                !req && !ep->stopped)
2560                                        write_fifo(ep, NULL);
2561                        }
2562                } else {
2563                        /* status; stop NAKing */
2564                        if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2565                                if (ep->dev->protocol_stall) {
2566                                        ep->stopped = 1;
2567                                        set_halt(ep);
2568                                }
2569                                mode = 2;
2570                        /* an extra OUT token is an error */
2571                        } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2572                                        req &&
2573                                        req->req.actual == req->req.length) ||
2574                                        (ep->responded && !req)) {
2575                                ep->dev->protocol_stall = 1;
2576                                set_halt(ep);
2577                                ep->stopped = 1;
2578                                if (req)
2579                                        done(ep, req, -EOVERFLOW);
2580                                req = NULL;
2581                        }
2582                }
2583        }
2584
2585        if (unlikely(!req))
2586                return;
2587
2588        /* manual DMA queue advance after short OUT */
2589        if (likely(ep->dma)) {
2590                if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2591                        struct net2280_request *stuck_req = NULL;
2592                        int     stopped = ep->stopped;
2593                        int     num_completed;
2594                        int     stuck = 0;
2595                        u32     count;
2596
2597                        /* TRANSFERRED works around OUT_DONE erratum 0112.
2598                         * we expect (N <= maxpacket) bytes; host wrote M.
2599                         * iff (M < N) we won't ever see a DMA interrupt.
2600                         */
2601                        ep->stopped = 1;
2602                        for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2603
2604                                /* any preceding dma transfers must finish.
2605                                 * dma handles (M >= N), may empty the queue
2606                                 */
2607                                num_completed = scan_dma_completions(ep);
2608                                if (unlikely(list_empty(&ep->queue) ||
2609                                                ep->out_overflow)) {
2610                                        req = NULL;
2611                                        break;
2612                                }
2613                                req = list_entry(ep->queue.next,
2614                                        struct net2280_request, queue);
2615
2616                                /* here either (M < N), a "real" short rx;
2617                                 * or (M == N) and the queue didn't empty
2618                                 */
2619                                if (likely(t & BIT(FIFO_EMPTY))) {
2620                                        count = readl(&ep->dma->dmacount);
2621                                        count &= DMA_BYTE_COUNT_MASK;
2622                                        if (readl(&ep->dma->dmadesc)
2623                                                        != req->td_dma)
2624                                                req = NULL;
2625                                        break;
2626                                }
2627
2628                                /* Escape loop if no dma transfers completed
2629                                 * after few retries.
2630                                 */
2631                                if (num_completed == 0) {
2632                                        if (stuck_req == req &&
2633                                            readl(&ep->dma->dmadesc) !=
2634                                                  req->td_dma && stuck++ > 5) {
2635                                                count = readl(
2636                                                        &ep->dma->dmacount);
2637                                                count &= DMA_BYTE_COUNT_MASK;
2638                                                req = NULL;
2639                                                ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2640                                                        ep->ep.name, stuck,
2641                                                        count);
2642                                                break;
2643                                        } else if (stuck_req != req) {
2644                                                stuck_req = req;
2645                                                stuck = 0;
2646                                        }
2647                                } else {
2648                                        stuck_req = NULL;
2649                                        stuck = 0;
2650                                }
2651
2652                                udelay(1);
2653                        }
2654
2655                        /* stop DMA, leave ep NAKing */
2656                        writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2657                        spin_stop_dma(ep->dma);
2658
2659                        if (likely(req)) {
2660                                req->td->dmacount = 0;
2661                                t = readl(&ep->regs->ep_avail);
2662                                dma_done(ep, req, count,
2663                                        (ep->out_overflow || t)
2664                                                ? -EOVERFLOW : 0);
2665                        }
2666
2667                        /* also flush to prevent erratum 0106 trouble */
2668                        if (unlikely(ep->out_overflow ||
2669                                        (ep->dev->chiprev == 0x0100 &&
2670                                        ep->dev->gadget.speed
2671                                        == USB_SPEED_FULL))) {
2672                                out_flush(ep);
2673                                ep->out_overflow = 0;
2674                        }
2675
2676                        /* (re)start dma if needed, stop NAKing */
2677                        ep->stopped = stopped;
2678                        if (!list_empty(&ep->queue))
2679                                restart_dma(ep);
2680                } else
2681                        ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2682                                        ep->ep.name, t);
2683                return;
2684
2685        /* data packet(s) received (in the fifo, OUT) */
2686        } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2687                if (read_fifo(ep, req) && ep->num != 0)
2688                        mode = 2;
2689
2690        /* data packet(s) transmitted (IN) */
2691        } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2692                unsigned        len;
2693
2694                len = req->req.length - req->req.actual;
2695                if (len > ep->ep.maxpacket)
2696                        len = ep->ep.maxpacket;
2697                req->req.actual += len;
2698
2699                /* if we wrote it all, we're usually done */
2700                /* send zlps until the status stage */
2701                if ((req->req.actual == req->req.length) &&
2702                        (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2703                                mode = 2;
2704
2705        /* there was nothing to do ...  */
2706        } else if (mode == 1)
2707                return;
2708
2709        /* done */
2710        if (mode == 2) {
2711                /* stream endpoints often resubmit/unlink in completion */
2712                done(ep, req, 0);
2713
2714                /* maybe advance queue to next request */
2715                if (ep->num == 0) {
2716                        /* NOTE:  net2280 could let gadget driver start the
2717                         * status stage later. since not all controllers let
2718                         * them control that, the api doesn't (yet) allow it.
2719                         */
2720                        if (!ep->stopped)
2721                                allow_status(ep);
2722                        req = NULL;
2723                } else {
2724                        if (!list_empty(&ep->queue) && !ep->stopped)
2725                                req = list_entry(ep->queue.next,
2726                                        struct net2280_request, queue);
2727                        else
2728                                req = NULL;
2729                        if (req && !ep->is_in)
2730                                stop_out_naking(ep);
2731                }
2732        }
2733
2734        /* is there a buffer for the next packet?
2735         * for best streaming performance, make sure there is one.
2736         */
2737        if (req && !ep->stopped) {
2738
2739                /* load IN fifo with next packet (may be zlp) */
2740                if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2741                        write_fifo(ep, &req->req);
2742        }
2743}
2744
2745static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2746{
2747        struct net2280_ep       *ep;
2748
2749        if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2750                return &dev->ep[0];
2751        list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2752                u8      bEndpointAddress;
2753
2754                if (!ep->desc)
2755                        continue;
2756                bEndpointAddress = ep->desc->bEndpointAddress;
2757                if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2758                        continue;
2759                if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2760                        return ep;
2761        }
2762        return NULL;
2763}
2764
2765static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2766{
2767        u32 scratch, fsmvalue;
2768        u32 ack_wait_timeout, state;
2769
2770        /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2771        scratch = get_idx_reg(dev->regs, SCRATCH);
2772        fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2773        scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2774
2775        if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2776                                (r.bRequestType & USB_DIR_IN)))
2777                return;
2778
2779        /* This is the first Control Read for this connection: */
2780        if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2781                /*
2782                 * Connection is NOT SS:
2783                 * - Connection must be FS or HS.
2784                 * - This FSM state should allow workaround software to
2785                 * run after the next USB connection.
2786                 */
2787                scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2788                dev->bug7734_patched = 1;
2789                goto restore_data_eps;
2790        }
2791
2792        /* Connection is SS: */
2793        for (ack_wait_timeout = 0;
2794                        ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2795                        ack_wait_timeout++) {
2796
2797                state = readl(&dev->plregs->pl_ep_status_1)
2798                        & (0xff << STATE);
2799                if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2800                        (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2801                        scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2802                        dev->bug7734_patched = 1;
2803                        break;
2804                }
2805
2806                /*
2807                 * We have not yet received host's Data Phase ACK
2808                 * - Wait and try again.
2809                 */
2810                udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2811
2812                continue;
2813        }
2814
2815
2816        if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2817                ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2818                "to detect SS host's data phase ACK.");
2819                ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2820                "got 0x%2.2x.\n", state >> STATE);
2821        } else {
2822                ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2823                "%duSec for Control Read Data Phase ACK\n",
2824                        DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2825        }
2826
2827restore_data_eps:
2828        /*
2829         * Restore data EPs to their pre-workaround settings (disabled,
2830         * initialized, and other details).
2831         */
2832        defect7374_disable_data_eps(dev);
2833
2834        set_idx_reg(dev->regs, SCRATCH, scratch);
2835
2836        return;
2837}
2838
2839static void ep_clear_seqnum(struct net2280_ep *ep)
2840{
2841        struct net2280 *dev = ep->dev;
2842        u32 val;
2843        static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2844
2845        val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2846        val |= ep_pl[ep->num];
2847        writel(val, &dev->plregs->pl_ep_ctrl);
2848        val |= BIT(SEQUENCE_NUMBER_RESET);
2849        writel(val, &dev->plregs->pl_ep_ctrl);
2850
2851        return;
2852}
2853
2854static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2855                struct net2280_ep *ep, struct usb_ctrlrequest r)
2856{
2857        int tmp = 0;
2858
2859#define w_value         le16_to_cpu(r.wValue)
2860#define w_index         le16_to_cpu(r.wIndex)
2861#define w_length        le16_to_cpu(r.wLength)
2862
2863        switch (r.bRequest) {
2864                struct net2280_ep *e;
2865                u16 status;
2866
2867        case USB_REQ_SET_CONFIGURATION:
2868                dev->addressed_state = !w_value;
2869                goto usb3_delegate;
2870
2871        case USB_REQ_GET_STATUS:
2872                switch (r.bRequestType) {
2873                case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2874                        status = dev->wakeup_enable ? 0x02 : 0x00;
2875                        if (dev->gadget.is_selfpowered)
2876                                status |= BIT(0);
2877                        status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2878                                                        dev->ltm_enable << 4);
2879                        writel(0, &dev->epregs[0].ep_irqenb);
2880                        set_fifo_bytecount(ep, sizeof(status));
2881                        writel((__force u32) status, &dev->epregs[0].ep_data);
2882                        allow_status_338x(ep);
2883                        break;
2884
2885                case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2886                        e = get_ep_by_addr(dev, w_index);
2887                        if (!e)
2888                                goto do_stall3;
2889                        status = readl(&e->regs->ep_rsp) &
2890                                                BIT(CLEAR_ENDPOINT_HALT);
2891                        writel(0, &dev->epregs[0].ep_irqenb);
2892                        set_fifo_bytecount(ep, sizeof(status));
2893                        writel((__force u32) status, &dev->epregs[0].ep_data);
2894                        allow_status_338x(ep);
2895                        break;
2896
2897                default:
2898                        goto usb3_delegate;
2899                }
2900                break;
2901
2902        case USB_REQ_CLEAR_FEATURE:
2903                switch (r.bRequestType) {
2904                case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2905                        if (!dev->addressed_state) {
2906                                switch (w_value) {
2907                                case USB_DEVICE_U1_ENABLE:
2908                                        dev->u1_enable = 0;
2909                                        writel(readl(&dev->usb_ext->usbctl2) &
2910                                                ~BIT(U1_ENABLE),
2911                                                &dev->usb_ext->usbctl2);
2912                                        allow_status_338x(ep);
2913                                        goto next_endpoints3;
2914
2915                                case USB_DEVICE_U2_ENABLE:
2916                                        dev->u2_enable = 0;
2917                                        writel(readl(&dev->usb_ext->usbctl2) &
2918                                                ~BIT(U2_ENABLE),
2919                                                &dev->usb_ext->usbctl2);
2920                                        allow_status_338x(ep);
2921                                        goto next_endpoints3;
2922
2923                                case USB_DEVICE_LTM_ENABLE:
2924                                        dev->ltm_enable = 0;
2925                                        writel(readl(&dev->usb_ext->usbctl2) &
2926                                                ~BIT(LTM_ENABLE),
2927                                                &dev->usb_ext->usbctl2);
2928                                        allow_status_338x(ep);
2929                                        goto next_endpoints3;
2930
2931                                default:
2932                                        break;
2933                                }
2934                        }
2935                        if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2936                                dev->wakeup_enable = 0;
2937                                writel(readl(&dev->usb->usbctl) &
2938                                        ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2939                                        &dev->usb->usbctl);
2940                                allow_status_338x(ep);
2941                                break;
2942                        }
2943                        goto usb3_delegate;
2944
2945                case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2946                        e = get_ep_by_addr(dev, w_index);
2947                        if (!e)
2948                                goto do_stall3;
2949                        if (w_value != USB_ENDPOINT_HALT)
2950                                goto do_stall3;
2951                        ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2952                        /*
2953                         * Workaround for SS SeqNum not cleared via
2954                         * Endpoint Halt (Clear) bit. select endpoint
2955                         */
2956                        ep_clear_seqnum(e);
2957                        clear_halt(e);
2958                        if (!list_empty(&e->queue) && e->td_dma)
2959                                restart_dma(e);
2960                        allow_status(ep);
2961                        ep->stopped = 1;
2962                        break;
2963
2964                default:
2965                        goto usb3_delegate;
2966                }
2967                break;
2968        case USB_REQ_SET_FEATURE:
2969                switch (r.bRequestType) {
2970                case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2971                        if (!dev->addressed_state) {
2972                                switch (w_value) {
2973                                case USB_DEVICE_U1_ENABLE:
2974                                        dev->u1_enable = 1;
2975                                        writel(readl(&dev->usb_ext->usbctl2) |
2976                                                BIT(U1_ENABLE),
2977                                                &dev->usb_ext->usbctl2);
2978                                        allow_status_338x(ep);
2979                                        goto next_endpoints3;
2980
2981                                case USB_DEVICE_U2_ENABLE:
2982                                        dev->u2_enable = 1;
2983                                        writel(readl(&dev->usb_ext->usbctl2) |
2984                                                BIT(U2_ENABLE),
2985                                                &dev->usb_ext->usbctl2);
2986                                        allow_status_338x(ep);
2987                                        goto next_endpoints3;
2988
2989                                case USB_DEVICE_LTM_ENABLE:
2990                                        dev->ltm_enable = 1;
2991                                        writel(readl(&dev->usb_ext->usbctl2) |
2992                                                BIT(LTM_ENABLE),
2993                                                &dev->usb_ext->usbctl2);
2994                                        allow_status_338x(ep);
2995                                        goto next_endpoints3;
2996                                default:
2997                                        break;
2998                                }
2999                        }
3000
3001                        if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3002                                dev->wakeup_enable = 1;
3003                                writel(readl(&dev->usb->usbctl) |
3004                                        BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3005                                        &dev->usb->usbctl);
3006                                allow_status_338x(ep);
3007                                break;
3008                        }
3009                        goto usb3_delegate;
3010
3011                case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3012                        e = get_ep_by_addr(dev, w_index);
3013                        if (!e || (w_value != USB_ENDPOINT_HALT))
3014                                goto do_stall3;
3015                        ep->stopped = 1;
3016                        if (ep->num == 0)
3017                                ep->dev->protocol_stall = 1;
3018                        else {
3019                                if (ep->dma)
3020                                        abort_dma(ep);
3021                                set_halt(ep);
3022                        }
3023                        allow_status_338x(ep);
3024                        break;
3025
3026                default:
3027                        goto usb3_delegate;
3028                }
3029
3030                break;
3031        default:
3032
3033usb3_delegate:
3034                ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3035                                r.bRequestType, r.bRequest,
3036                                w_value, w_index, w_length,
3037                                readl(&ep->cfg->ep_cfg));
3038
3039                ep->responded = 0;
3040                spin_unlock(&dev->lock);
3041                tmp = dev->driver->setup(&dev->gadget, &r);
3042                spin_lock(&dev->lock);
3043        }
3044do_stall3:
3045        if (tmp < 0) {
3046                ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3047                                r.bRequestType, r.bRequest, tmp);
3048                dev->protocol_stall = 1;
3049                /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3050                set_halt(ep);
3051        }
3052
3053next_endpoints3:
3054
3055#undef  w_value
3056#undef  w_index
3057#undef  w_length
3058
3059        return;
3060}
3061
3062static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3063{
3064        u32 index;
3065        u32 bit;
3066
3067        for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3068                bit = BIT(ep_bit[index]);
3069
3070                if (!stat0)
3071                        break;
3072
3073                if (!(stat0 & bit))
3074                        continue;
3075
3076                stat0 &= ~bit;
3077
3078                handle_ep_small(&dev->ep[index]);
3079        }
3080}
3081
3082static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3083{
3084        struct net2280_ep       *ep;
3085        u32                     num, scratch;
3086
3087        /* most of these don't need individual acks */
3088        stat &= ~BIT(INTA_ASSERTED);
3089        if (!stat)
3090                return;
3091        /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3092
3093        /* starting a control request? */
3094        if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3095                union {
3096                        u32                     raw[2];
3097                        struct usb_ctrlrequest  r;
3098                } u;
3099                int                             tmp;
3100                struct net2280_request          *req;
3101
3102                if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3103                        u32 val = readl(&dev->usb->usbstat);
3104                        if (val & BIT(SUPER_SPEED)) {
3105                                dev->gadget.speed = USB_SPEED_SUPER;
3106                                usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3107                                                EP0_SS_MAX_PACKET_SIZE);
3108                        } else if (val & BIT(HIGH_SPEED)) {
3109                                dev->gadget.speed = USB_SPEED_HIGH;
3110                                usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3111                                                EP0_HS_MAX_PACKET_SIZE);
3112                        } else {
3113                                dev->gadget.speed = USB_SPEED_FULL;
3114                                usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3115                                                EP0_HS_MAX_PACKET_SIZE);
3116                        }
3117                        net2280_led_speed(dev, dev->gadget.speed);
3118                        ep_dbg(dev, "%s\n",
3119                                        usb_speed_string(dev->gadget.speed));
3120                }
3121
3122                ep = &dev->ep[0];
3123                ep->irqs++;
3124
3125                /* make sure any leftover request state is cleared */
3126                stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3127                while (!list_empty(&ep->queue)) {
3128                        req = list_entry(ep->queue.next,
3129                                        struct net2280_request, queue);
3130                        done(ep, req, (req->req.actual == req->req.length)
3131                                                ? 0 : -EPROTO);
3132                }
3133                ep->stopped = 0;
3134                dev->protocol_stall = 0;
3135                if (!(dev->quirks & PLX_PCIE)) {
3136                        if (ep->dev->quirks & PLX_2280)
3137                                tmp = BIT(FIFO_OVERFLOW) |
3138                                    BIT(FIFO_UNDERFLOW);
3139                        else
3140                                tmp = 0;
3141
3142                        writel(tmp | BIT(TIMEOUT) |
3143                                   BIT(USB_STALL_SENT) |
3144                                   BIT(USB_IN_NAK_SENT) |
3145                                   BIT(USB_IN_ACK_RCVD) |
3146                                   BIT(USB_OUT_PING_NAK_SENT) |
3147                                   BIT(USB_OUT_ACK_SENT) |
3148                                   BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3149                                   BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3150                                   BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3151                                   BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3152                                   BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3153                                   BIT(DATA_IN_TOKEN_INTERRUPT),
3154                                   &ep->regs->ep_stat);
3155                }
3156                u.raw[0] = readl(&dev->usb->setup0123);
3157                u.raw[1] = readl(&dev->usb->setup4567);
3158
3159                cpu_to_le32s(&u.raw[0]);
3160                cpu_to_le32s(&u.raw[1]);
3161
3162                if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3163                        defect7374_workaround(dev, u.r);
3164
3165                tmp = 0;
3166
3167#define w_value         le16_to_cpu(u.r.wValue)
3168#define w_index         le16_to_cpu(u.r.wIndex)
3169#define w_length        le16_to_cpu(u.r.wLength)
3170
3171                /* ack the irq */
3172                writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3173                stat ^= BIT(SETUP_PACKET_INTERRUPT);
3174
3175                /* watch control traffic at the token level, and force
3176                 * synchronization before letting the status stage happen.
3177                 * FIXME ignore tokens we'll NAK, until driver responds.
3178                 * that'll mean a lot less irqs for some drivers.
3179                 */
3180                ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3181                if (ep->is_in) {
3182                        scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3183                                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3184                                BIT(DATA_IN_TOKEN_INTERRUPT);
3185                        stop_out_naking(ep);
3186                } else
3187                        scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3188                                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3189                                BIT(DATA_IN_TOKEN_INTERRUPT);
3190                writel(scratch, &dev->epregs[0].ep_irqenb);
3191
3192                /* we made the hardware handle most lowlevel requests;
3193                 * everything else goes uplevel to the gadget code.
3194                 */
3195                ep->responded = 1;
3196
3197                if (dev->gadget.speed == USB_SPEED_SUPER) {
3198                        handle_stat0_irqs_superspeed(dev, ep, u.r);
3199                        goto next_endpoints;
3200                }
3201
3202                switch (u.r.bRequest) {
3203                case USB_REQ_GET_STATUS: {
3204                        struct net2280_ep       *e;
3205                        __le32                  status;
3206
3207                        /* hw handles device and interface status */
3208                        if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3209                                goto delegate;
3210                        e = get_ep_by_addr(dev, w_index);
3211                        if (!e || w_length > 2)
3212                                goto do_stall;
3213
3214                        if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3215                                status = cpu_to_le32(1);
3216                        else
3217                                status = cpu_to_le32(0);
3218
3219                        /* don't bother with a request object! */
3220                        writel(0, &dev->epregs[0].ep_irqenb);
3221                        set_fifo_bytecount(ep, w_length);
3222                        writel((__force u32)status, &dev->epregs[0].ep_data);
3223                        allow_status(ep);
3224                        ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3225                        goto next_endpoints;
3226                        }
3227                        break;
3228                case USB_REQ_CLEAR_FEATURE: {
3229                        struct net2280_ep       *e;
3230
3231                        /* hw handles device features */
3232                        if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3233                                goto delegate;
3234                        if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3235                                goto do_stall;
3236                        e = get_ep_by_addr(dev, w_index);
3237                        if (!e)
3238                                goto do_stall;
3239                        if (e->wedged) {
3240                                ep_vdbg(dev, "%s wedged, halt not cleared\n",
3241                                                ep->ep.name);
3242                        } else {
3243                                ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3244                                clear_halt(e);
3245                                if ((ep->dev->quirks & PLX_PCIE) &&
3246                                        !list_empty(&e->queue) && e->td_dma)
3247                                                restart_dma(e);
3248                        }
3249                        allow_status(ep);
3250                        goto next_endpoints;
3251                        }
3252                        break;
3253                case USB_REQ_SET_FEATURE: {
3254                        struct net2280_ep       *e;
3255
3256                        /* hw handles device features */
3257                        if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3258                                goto delegate;
3259                        if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3260                                goto do_stall;
3261                        e = get_ep_by_addr(dev, w_index);
3262                        if (!e)
3263                                goto do_stall;
3264                        if (e->ep.name == ep0name)
3265                                goto do_stall;
3266                        set_halt(e);
3267                        if ((dev->quirks & PLX_PCIE) && e->dma)
3268                                abort_dma(e);
3269                        allow_status(ep);
3270                        ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3271                        goto next_endpoints;
3272                        }
3273                        break;
3274                default:
3275delegate:
3276                        ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3277                                "ep_cfg %08x\n",
3278                                u.r.bRequestType, u.r.bRequest,
3279                                w_value, w_index, w_length,
3280                                readl(&ep->cfg->ep_cfg));
3281                        ep->responded = 0;
3282                        spin_unlock(&dev->lock);
3283                        tmp = dev->driver->setup(&dev->gadget, &u.r);
3284                        spin_lock(&dev->lock);
3285                }
3286
3287                /* stall ep0 on error */
3288                if (tmp < 0) {
3289do_stall:
3290                        ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3291                                        u.r.bRequestType, u.r.bRequest, tmp);
3292                        dev->protocol_stall = 1;
3293                }
3294
3295                /* some in/out token irq should follow; maybe stall then.
3296                 * driver must queue a request (even zlp) or halt ep0
3297                 * before the host times out.
3298                 */
3299        }
3300
3301#undef  w_value
3302#undef  w_index
3303#undef  w_length
3304
3305next_endpoints:
3306        if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3307                u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3308                        USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3309                        USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3310
3311                if (stat & mask) {
3312                        usb338x_handle_ep_intr(dev, stat & mask);
3313                        stat &= ~mask;
3314                }
3315        } else {
3316                /* endpoint data irq ? */
3317                scratch = stat & 0x7f;
3318                stat &= ~0x7f;
3319                for (num = 0; scratch; num++) {
3320                        u32             t;
3321
3322                        /* do this endpoint's FIFO and queue need tending? */
3323                        t = BIT(num);
3324                        if ((scratch & t) == 0)
3325                                continue;
3326                        scratch ^= t;
3327
3328                        ep = &dev->ep[num];
3329                        handle_ep_small(ep);
3330                }
3331        }
3332
3333        if (stat)
3334                ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3335}
3336
3337#define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3338                BIT(DMA_C_INTERRUPT) | \
3339                BIT(DMA_B_INTERRUPT) | \
3340                BIT(DMA_A_INTERRUPT))
3341#define PCI_ERROR_INTERRUPTS ( \
3342                BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3343                BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3344                BIT(PCI_RETRY_ABORT_INTERRUPT))
3345
3346static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3347__releases(dev->lock)
3348__acquires(dev->lock)
3349{
3350        struct net2280_ep       *ep;
3351        u32                     tmp, num, mask, scratch;
3352
3353        /* after disconnect there's nothing else to do! */
3354        tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3355        mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3356
3357        /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3358         * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3359         * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3360         * only indicates a change in the reset state).
3361         */
3362        if (stat & tmp) {
3363                bool    reset = false;
3364                bool    disconnect = false;
3365
3366                /*
3367                 * Ignore disconnects and resets if the speed hasn't been set.
3368                 * VBUS can bounce and there's always an initial reset.
3369                 */
3370                writel(tmp, &dev->regs->irqstat1);
3371                if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3372                        if ((stat & BIT(VBUS_INTERRUPT)) &&
3373                                        (readl(&dev->usb->usbctl) &
3374                                                BIT(VBUS_PIN)) == 0) {
3375                                disconnect = true;
3376                                ep_dbg(dev, "disconnect %s\n",
3377                                                dev->driver->driver.name);
3378                        } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3379                                        (readl(&dev->usb->usbstat) & mask)
3380                                                == 0) {
3381                                reset = true;
3382                                ep_dbg(dev, "reset %s\n",
3383                                                dev->driver->driver.name);
3384                        }
3385
3386                        if (disconnect || reset) {
3387                                stop_activity(dev, dev->driver);
3388                                ep0_start(dev);
3389                                spin_unlock(&dev->lock);
3390                                if (reset)
3391                                        usb_gadget_udc_reset
3392                                                (&dev->gadget, dev->driver);
3393                                else
3394                                        (dev->driver->disconnect)
3395                                                (&dev->gadget);
3396                                spin_lock(&dev->lock);
3397                                return;
3398                        }
3399                }
3400                stat &= ~tmp;
3401
3402                /* vBUS can bounce ... one of many reasons to ignore the
3403                 * notion of hotplug events on bus connect/disconnect!
3404                 */
3405                if (!stat)
3406                        return;
3407        }
3408
3409        /* NOTE: chip stays in PCI D0 state for now, but it could
3410         * enter D1 to save more power
3411         */
3412        tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3413        if (stat & tmp) {
3414                writel(tmp, &dev->regs->irqstat1);
3415                spin_unlock(&dev->lock);
3416                if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3417                        if (dev->driver->suspend)
3418                                dev->driver->suspend(&dev->gadget);
3419                        if (!enable_suspend)
3420                                stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3421                } else {
3422                        if (dev->driver->resume)
3423                                dev->driver->resume(&dev->gadget);
3424                        /* at high speed, note erratum 0133 */
3425                }
3426                spin_lock(&dev->lock);
3427                stat &= ~tmp;
3428        }
3429
3430        /* clear any other status/irqs */
3431        if (stat)
3432                writel(stat, &dev->regs->irqstat1);
3433
3434        /* some status we can just ignore */
3435        if (dev->quirks & PLX_2280)
3436                stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3437                          BIT(SUSPEND_REQUEST_INTERRUPT) |
3438                          BIT(RESUME_INTERRUPT) |
3439                          BIT(SOF_INTERRUPT));
3440        else
3441                stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3442                          BIT(RESUME_INTERRUPT) |
3443                          BIT(SOF_DOWN_INTERRUPT) |
3444                          BIT(SOF_INTERRUPT));
3445
3446        if (!stat)
3447                return;
3448        /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3449
3450        /* DMA status, for ep-{a,b,c,d} */
3451        scratch = stat & DMA_INTERRUPTS;
3452        stat &= ~DMA_INTERRUPTS;
3453        scratch >>= 9;
3454        for (num = 0; scratch; num++) {
3455                struct net2280_dma_regs __iomem *dma;
3456
3457                tmp = BIT(num);
3458                if ((tmp & scratch) == 0)
3459                        continue;
3460                scratch ^= tmp;
3461
3462                ep = &dev->ep[num + 1];
3463                dma = ep->dma;
3464
3465                if (!dma)
3466                        continue;
3467
3468                /* clear ep's dma status */
3469                tmp = readl(&dma->dmastat);
3470                writel(tmp, &dma->dmastat);
3471
3472                /* dma sync*/
3473                if (dev->quirks & PLX_PCIE) {
3474                        u32 r_dmacount = readl(&dma->dmacount);
3475                        if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3476                            (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3477                                continue;
3478                }
3479
3480                if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3481                        ep_dbg(ep->dev, "%s no xact done? %08x\n",
3482                                ep->ep.name, tmp);
3483                        continue;
3484                }
3485                stop_dma(ep->dma);
3486
3487                /* OUT transfers terminate when the data from the
3488                 * host is in our memory.  Process whatever's done.
3489                 * On this path, we know transfer's last packet wasn't
3490                 * less than req->length. NAK_OUT_PACKETS may be set,
3491                 * or the FIFO may already be holding new packets.
3492                 *
3493                 * IN transfers can linger in the FIFO for a very
3494                 * long time ... we ignore that for now, accounting
3495                 * precisely (like PIO does) needs per-packet irqs
3496                 */
3497                scan_dma_completions(ep);
3498
3499                /* disable dma on inactive queues; else maybe restart */
3500                if (!list_empty(&ep->queue)) {
3501                        tmp = readl(&dma->dmactl);
3502                        restart_dma(ep);
3503                }
3504                ep->irqs++;
3505        }
3506
3507        /* NOTE:  there are other PCI errors we might usefully notice.
3508         * if they appear very often, here's where to try recovering.
3509         */
3510        if (stat & PCI_ERROR_INTERRUPTS) {
3511                ep_err(dev, "pci dma error; stat %08x\n", stat);
3512                stat &= ~PCI_ERROR_INTERRUPTS;
3513                /* these are fatal errors, but "maybe" they won't
3514                 * happen again ...
3515                 */
3516                stop_activity(dev, dev->driver);
3517                ep0_start(dev);
3518                stat = 0;
3519        }
3520
3521        if (stat)
3522                ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3523}
3524
3525static irqreturn_t net2280_irq(int irq, void *_dev)
3526{
3527        struct net2280          *dev = _dev;
3528
3529        /* shared interrupt, not ours */
3530        if ((dev->quirks & PLX_LEGACY) &&
3531                (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3532                return IRQ_NONE;
3533
3534        spin_lock(&dev->lock);
3535
3536        /* handle disconnect, dma, and more */
3537        handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3538
3539        /* control requests and PIO */
3540        handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3541
3542        if (dev->quirks & PLX_PCIE) {
3543                /* re-enable interrupt to trigger any possible new interrupt */
3544                u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3545                writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3546                writel(pciirqenb1, &dev->regs->pciirqenb1);
3547        }
3548
3549        spin_unlock(&dev->lock);
3550
3551        return IRQ_HANDLED;
3552}
3553
3554/*-------------------------------------------------------------------------*/
3555
3556static void gadget_release(struct device *_dev)
3557{
3558        struct net2280  *dev = dev_get_drvdata(_dev);
3559
3560        kfree(dev);
3561}
3562
3563/* tear down the binding between this driver and the pci device */
3564
3565static void net2280_remove(struct pci_dev *pdev)
3566{
3567        struct net2280          *dev = pci_get_drvdata(pdev);
3568
3569        usb_del_gadget_udc(&dev->gadget);
3570
3571        BUG_ON(dev->driver);
3572
3573        /* then clean up the resources we allocated during probe() */
3574        if (dev->requests) {
3575                int             i;
3576                for (i = 1; i < 5; i++) {
3577                        if (!dev->ep[i].dummy)
3578                                continue;
3579                        dma_pool_free(dev->requests, dev->ep[i].dummy,
3580                                        dev->ep[i].td_dma);
3581                }
3582                dma_pool_destroy(dev->requests);
3583        }
3584        if (dev->got_irq)
3585                free_irq(pdev->irq, dev);
3586        if (dev->quirks & PLX_PCIE)
3587                pci_disable_msi(pdev);
3588        if (dev->regs) {
3589                net2280_led_shutdown(dev);
3590                iounmap(dev->regs);
3591        }
3592        if (dev->region)
3593                release_mem_region(pci_resource_start(pdev, 0),
3594                                pci_resource_len(pdev, 0));
3595        if (dev->enabled)
3596                pci_disable_device(pdev);
3597        device_remove_file(&pdev->dev, &dev_attr_registers);
3598
3599        ep_info(dev, "unbind\n");
3600}
3601
3602/* wrap this driver around the specified device, but
3603 * don't respond over USB until a gadget driver binds to us.
3604 */
3605
3606static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3607{
3608        struct net2280          *dev;
3609        unsigned long           resource, len;
3610        void                    __iomem *base = NULL;
3611        int                     retval, i;
3612
3613        /* alloc, and start init */
3614        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3615        if (dev == NULL) {
3616                retval = -ENOMEM;
3617                goto done;
3618        }
3619
3620        pci_set_drvdata(pdev, dev);
3621        spin_lock_init(&dev->lock);
3622        dev->quirks = id->driver_data;
3623        dev->pdev = pdev;
3624        dev->gadget.ops = &net2280_ops;
3625        dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3626                                USB_SPEED_SUPER : USB_SPEED_HIGH;
3627
3628        /* the "gadget" abstracts/virtualizes the controller */
3629        dev->gadget.name = driver_name;
3630
3631        /* now all the pci goodies ... */
3632        if (pci_enable_device(pdev) < 0) {
3633                retval = -ENODEV;
3634                goto done;
3635        }
3636        dev->enabled = 1;
3637
3638        /* BAR 0 holds all the registers
3639         * BAR 1 is 8051 memory; unused here (note erratum 0103)
3640         * BAR 2 is fifo memory; unused here
3641         */
3642        resource = pci_resource_start(pdev, 0);
3643        len = pci_resource_len(pdev, 0);
3644        if (!request_mem_region(resource, len, driver_name)) {
3645                ep_dbg(dev, "controller already in use\n");
3646                retval = -EBUSY;
3647                goto done;
3648        }
3649        dev->region = 1;
3650
3651        /* FIXME provide firmware download interface to put
3652         * 8051 code into the chip, e.g. to turn on PCI PM.
3653         */
3654
3655        base = ioremap_nocache(resource, len);
3656        if (base == NULL) {
3657                ep_dbg(dev, "can't map memory\n");
3658                retval = -EFAULT;
3659                goto done;
3660        }
3661        dev->regs = (struct net2280_regs __iomem *) base;
3662        dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3663        dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3664        dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3665        dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3666        dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3667
3668        if (dev->quirks & PLX_PCIE) {
3669                u32 fsmvalue;
3670                u32 usbstat;
3671                dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3672                                                        (base + 0x00b4);
3673                dev->llregs = (struct usb338x_ll_regs __iomem *)
3674                                                        (base + 0x0700);
3675                dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3676                                                        (base + 0x0748);
3677                dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3678                                                        (base + 0x077c);
3679                dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3680                                                        (base + 0x079c);
3681                dev->plregs = (struct usb338x_pl_regs __iomem *)
3682                                                        (base + 0x0800);
3683                usbstat = readl(&dev->usb->usbstat);
3684                dev->enhanced_mode = !!(usbstat & BIT(11));
3685                dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3686                /* put into initial config, link up all endpoints */
3687                fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3688                                        (0xf << DEFECT7374_FSM_FIELD);
3689                /* See if firmware needs to set up for workaround: */
3690                if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3691                        dev->bug7734_patched = 1;
3692                        writel(0, &dev->usb->usbctl);
3693                } else
3694                        dev->bug7734_patched = 0;
3695        } else {
3696                dev->enhanced_mode = 0;
3697                dev->n_ep = 7;
3698                /* put into initial config, link up all endpoints */
3699                writel(0, &dev->usb->usbctl);
3700        }
3701
3702        usb_reset(dev);
3703        usb_reinit(dev);
3704
3705        /* irq setup after old hardware is cleaned up */
3706        if (!pdev->irq) {
3707                ep_err(dev, "No IRQ.  Check PCI setup!\n");
3708                retval = -ENODEV;
3709                goto done;
3710        }
3711
3712        if (dev->quirks & PLX_PCIE)
3713                if (pci_enable_msi(pdev))
3714                        ep_err(dev, "Failed to enable MSI mode\n");
3715
3716        if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3717                                                        driver_name, dev)) {
3718                ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3719                retval = -EBUSY;
3720                goto done;
3721        }
3722        dev->got_irq = 1;
3723
3724        /* DMA setup */
3725        /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3726        dev->requests = dma_pool_create("requests", &pdev->dev,
3727                sizeof(struct net2280_dma),
3728                0 /* no alignment requirements */,
3729                0 /* or page-crossing issues */);
3730        if (!dev->requests) {
3731                ep_dbg(dev, "can't get request pool\n");
3732                retval = -ENOMEM;
3733                goto done;
3734        }
3735        for (i = 1; i < 5; i++) {
3736                struct net2280_dma      *td;
3737
3738                td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3739                                &dev->ep[i].td_dma);
3740                if (!td) {
3741                        ep_dbg(dev, "can't get dummy %d\n", i);
3742                        retval = -ENOMEM;
3743                        goto done;
3744                }
3745                td->dmacount = 0;       /* not VALID */
3746                td->dmadesc = td->dmaaddr;
3747                dev->ep[i].dummy = td;
3748        }
3749
3750        /* enable lower-overhead pci memory bursts during DMA */
3751        if (dev->quirks & PLX_LEGACY)
3752                writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3753                        /*
3754                         * 256 write retries may not be enough...
3755                           BIT(PCI_RETRY_ABORT_ENABLE) |
3756                        */
3757                        BIT(DMA_READ_MULTIPLE_ENABLE) |
3758                        BIT(DMA_READ_LINE_ENABLE),
3759                        &dev->pci->pcimstctl);
3760        /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3761        pci_set_master(pdev);
3762        pci_try_set_mwi(pdev);
3763
3764        /* ... also flushes any posted pci writes */
3765        dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3766
3767        /* done */
3768        ep_info(dev, "%s\n", driver_desc);
3769        ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3770                        pdev->irq, base, dev->chiprev);
3771        ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3772                dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3773        retval = device_create_file(&pdev->dev, &dev_attr_registers);
3774        if (retval)
3775                goto done;
3776
3777        retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3778                        gadget_release);
3779        if (retval)
3780                goto done;
3781        return 0;
3782
3783done:
3784        if (dev)
3785                net2280_remove(pdev);
3786        return retval;
3787}
3788
3789/* make sure the board is quiescent; otherwise it will continue
3790 * generating IRQs across the upcoming reboot.
3791 */
3792
3793static void net2280_shutdown(struct pci_dev *pdev)
3794{
3795        struct net2280          *dev = pci_get_drvdata(pdev);
3796
3797        /* disable IRQs */
3798        writel(0, &dev->regs->pciirqenb0);
3799        writel(0, &dev->regs->pciirqenb1);
3800
3801        /* disable the pullup so the host will think we're gone */
3802        writel(0, &dev->usb->usbctl);
3803
3804}
3805
3806
3807/*-------------------------------------------------------------------------*/
3808
3809static const struct pci_device_id pci_ids[] = { {
3810        .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3811        .class_mask =   ~0,
3812        .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3813        .device =       0x2280,
3814        .subvendor =    PCI_ANY_ID,
3815        .subdevice =    PCI_ANY_ID,
3816        .driver_data =  PLX_LEGACY | PLX_2280,
3817        }, {
3818        .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3819        .class_mask =   ~0,
3820        .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3821        .device =       0x2282,
3822        .subvendor =    PCI_ANY_ID,
3823        .subdevice =    PCI_ANY_ID,
3824        .driver_data =  PLX_LEGACY,
3825        },
3826        {
3827        .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3828        .class_mask =   ~0,
3829        .vendor =       PCI_VENDOR_ID_PLX,
3830        .device =       0x2380,
3831        .subvendor =    PCI_ANY_ID,
3832        .subdevice =    PCI_ANY_ID,
3833        .driver_data =  PLX_PCIE,
3834         },
3835        {
3836        .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3837        .class_mask =   ~0,
3838        .vendor =       PCI_VENDOR_ID_PLX,
3839        .device =       0x3380,
3840        .subvendor =    PCI_ANY_ID,
3841        .subdevice =    PCI_ANY_ID,
3842        .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3843         },
3844        {
3845        .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3846        .class_mask =   ~0,
3847        .vendor =       PCI_VENDOR_ID_PLX,
3848        .device =       0x3382,
3849        .subvendor =    PCI_ANY_ID,
3850        .subdevice =    PCI_ANY_ID,
3851        .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3852         },
3853{ /* end: all zeroes */ }
3854};
3855MODULE_DEVICE_TABLE(pci, pci_ids);
3856
3857/* pci driver glue; this is a "new style" PCI driver module */
3858static struct pci_driver net2280_pci_driver = {
3859        .name =         (char *) driver_name,
3860        .id_table =     pci_ids,
3861
3862        .probe =        net2280_probe,
3863        .remove =       net2280_remove,
3864        .shutdown =     net2280_shutdown,
3865
3866        /* FIXME add power management support */
3867};
3868
3869module_pci_driver(net2280_pci_driver);
3870
3871MODULE_DESCRIPTION(DRIVER_DESC);
3872MODULE_AUTHOR("David Brownell");
3873MODULE_LICENSE("GPL");
3874